How to Reset Mpg on a Subaru Outback

Resetting the MPG (miles per gallon) on your Subaru Outback is simple and helps you track fuel efficiency accurately. Whether you’re filling up your tank or starting a new trip, knowing how to reset the trip computer ensures you get reliable data every time.

Key Takeaways

• Understand the difference between trip meters and MPG readings: The Subaru Outback displays both trip distance and average fuel economy, which can be reset independently.
• Use the steering wheel controls for most models: Starting with 2010 and newer Outbacks, the MPG reset is done via buttons on the steering wheel.
• Older models may require the trip odometer button: Pre-2010 Outbacks often use the trip button on the instrument cluster to reset fuel economy data.
• Reset after every fill-up for best tracking: This gives you the most accurate average MPG over time and helps monitor fuel efficiency trends.
• The process varies slightly by model year: Always check your owner’s manual or follow year-specific steps to avoid confusion.
• Instant MPG vs. average MPG: Know which reading you’re resetting—average MPG is cumulative, while instant MPG shows real-time fuel use.
• Keep a fuel log for deeper insights: Combine reset MPG data with manual fuel logs to analyze driving habits and vehicle performance.

Why Resetting MPG on Your Subaru Outback Matters

So, you just filled up your Subaru Outback and noticed the MPG reading hasn’t changed in weeks. Maybe it’s stuck at 24.3 mpg, even though you’ve driven 300 miles since your last fill-up. Sound familiar? That’s because the average fuel economy display hasn’t been reset—and it’s not tracking your latest driving habits accurately.

Resetting the MPG on your Subaru Outback isn’t just a neat trick—it’s a practical way to monitor your vehicle’s fuel efficiency. Whether you’re trying to improve gas mileage, comparing driving styles, or just curious about how your Outback performs on highways versus city streets, resetting the trip computer gives you fresh, reliable data. It’s especially useful after long trips, seasonal changes, or when you switch to different fuel types.

Think of it like resetting a fitness tracker after a workout. You want to measure progress from a clean slate. The same goes for your car. Without resetting, your average MPG blends old and new data, making it harder to spot trends or improvements. Plus, if you’re tracking fuel costs for budgeting or reimbursement, accurate MPG readings are essential.

Understanding Your Subaru Outback’s Trip Computer

Before we dive into the how-to, let’s talk about what’s actually happening behind the scenes. Your Subaru Outback comes equipped with a digital trip computer that tracks a variety of driving metrics. This includes trip distance, average speed, fuel range, and—most importantly—average fuel economy (MPG).

The MPG reading you see on your dashboard is typically the average fuel economy since the last reset. It’s calculated by dividing the total distance traveled by the amount of fuel used. This number updates continuously as you drive, giving you a rolling average. There’s also an instant MPG display on some models, which shows real-time fuel consumption based on current driving conditions—like acceleration, speed, and terrain.

Types of MPG Readings

It’s important to know the difference between average and instant MPG:

• Average MPG: This is the cumulative fuel economy since the last reset. It’s the number most drivers care about when tracking efficiency over time.
• Instant MPG: This fluctuates with every press of the gas pedal. It’s great for learning fuel-efficient driving habits but isn’t useful for long-term tracking.

When you reset the MPG, you’re only resetting the average reading. The instant MPG continues to update in real time and doesn’t need to be reset.

Where to Find the MPG Display

On most Subaru Outbacks, the MPG reading appears in the instrument cluster, usually in the center of the speedometer. It’s often labeled as “Avg MPG” or “Fuel Economy.” Some newer models (2015 and later) also display this information on the multi-information display (MID) screen, which can be accessed through the steering wheel controls.

If you’re not seeing the MPG reading, you may need to cycle through the display modes. On models with a MID, press the “INFO” or “DISP” button on the steering wheel until you find the fuel economy screen.

How to Reset MPG on a Subaru Outback (Step-by-Step Guide)

Now for the main event: how to actually reset the MPG on your Subaru Outback. The process varies slightly depending on your model year, but the core idea is the same—access the trip computer and reset the average fuel economy reading. Below, we’ll walk you through the steps for different generations of the Outback.

For 2010–2024 Subaru Outback Models (Steering Wheel Controls)

Most modern Subaru Outbacks (2010 and newer) use steering wheel-mounted buttons to control the trip computer. Here’s how to reset the MPG:

1. Turn on the ignition: You don’t need to start the engine, but the car should be in the “ON” position (dashboard lights on).
2. Locate the “INFO” or “DISP” button: This is usually on the left side of the steering wheel. Press it repeatedly until you see the “Avg MPG” or “Fuel Economy” screen.
3. Press and hold the “INFO” button: Once you’re on the correct screen, press and hold the “INFO” button for about 3–5 seconds.
4. Wait for the reset: The average MPG should drop to 0.0 or reset to a new value. You may see a confirmation message like “Reset Complete” or the numbers will flash briefly.
5. Release the button: The system will return to normal operation, and your new average MPG tracking will begin.

Pro Tip: If you have a 2015 or newer Outback with the STARLINK system, you might also access this through the touchscreen. Go to “Vehicle” > “Trip Computer” > “Reset” to find the option.

For 2000–2009 Subaru Outback Models (Trip Odometer Button)

Older Outbacks (pre-2010) typically use a physical button on the instrument cluster to reset trip data. Here’s how it works:

1. Turn the ignition to “ON”: Again, the engine doesn’t need to be running.
2. Locate the trip odometer button: This is usually a small button near the speedometer, often labeled “TRIP” or “ODO/TRIP.”
3. Press the button to cycle to “Trip A” or “Trip B”: These are separate trip meters. Choose the one you want to reset (most people use Trip A for fuel tracking).
4. Press and hold the button: Hold it down for 3–5 seconds until the trip distance and average MPG reset to zero.
5. Release and confirm: The display should now show 0.0 miles and 0.0 MPG. Your new tracking has begun.

Note: On some 2008–2009 models, the MPG reset may only work when the trip meter is selected. Make sure you’re on the correct trip mode before holding the button.

For 1995–1999 Subaru Outback Models (Mechanical Trip Reset)

If you’re driving a classic Outback from the late ’90s, the process is even simpler—but more manual. These models often have a mechanical trip odometer with a reset stem.

1. Turn the ignition to “ON.”
2. Find the trip reset stem: This is a small knob or stem near the speedometer, usually on the right side.
3. Press and hold the stem: Hold it down for a few seconds.
4. Watch for the numbers to reset: The trip distance and MPG (if displayed) should return to zero.

Important: Older models may not display average MPG digitally. Instead, you might only see trip distance. In that case, you’ll need to manually calculate MPG by dividing miles driven by gallons used at the pump.

Tips for Accurate MPG Tracking

Resetting the MPG is just the first step. To get the most out of your Subaru Outback’s fuel economy data, follow these best practices:

Reset After Every Fill-Up

The most accurate way to track MPG is to reset the trip computer every time you fill your gas tank. This gives you a clean measurement for each tank of fuel. For example, if you drive 320 miles on 13 gallons of gas, your MPG is about 24.6. Without resetting, that number gets mixed with previous data, skewing your results.

Use the Same Gas Station and Pump

Fuel quality and pump calibration can vary slightly between stations. For consistent tracking, try to use the same gas station and even the same pump when possible. This reduces variables that could affect your MPG readings.

Drive Normally

Avoid aggressive driving during your tracking period. Hard acceleration, speeding, and frequent braking can lower your MPG significantly. If you’re testing fuel efficiency, drive as you normally would—don’t baby the car or drive unusually slow.

Monitor Seasonal Changes

Your Outback’s MPG can vary with the seasons. Cold weather reduces fuel efficiency due to longer warm-up times and increased use of heaters. Reset your MPG at the start of each season to see how temperature affects your driving.

Combine with a Fuel Log

For deeper insights, keep a simple fuel log in a notebook or app. Record the date, odometer reading, gallons pumped, and cost. Over time, you’ll spot patterns—like lower MPG during winter or higher efficiency on highway trips.

Check Tire Pressure Regularly

Underinflated tires increase rolling resistance, which lowers MPG. Check your tire pressure monthly and keep it at the recommended PSI (found on the driver’s door jamb). Properly inflated tires can improve fuel economy by up to 3%.

Troubleshooting Common MPG Reset Issues

Sometimes, resetting the MPG doesn’t work as expected. Here are a few common problems and how to fix them:

The MPG Won’t Reset

If pressing and holding the button doesn’t reset the reading, try these steps:

• Make sure the ignition is on: The car must be in the “ON” position, not just accessory mode.
• Check if you’re on the right screen: You need to be viewing the average MPG or trip meter before resetting.
• Try a longer hold: Some models require holding the button for 5–10 seconds.
• Restart the process: Turn the ignition off, wait 10 seconds, then try again.

The Reset Works, But the Number Doesn’t Change

If the MPG resets to zero but then jumps back to the old number, the system may be pulling data from a stored memory. This is rare but can happen after a battery disconnect. In most cases, driving for a few miles will allow the system to recalculate based on new data.

Instant MPG Is Inaccurate

The instant MPG display can be misleading. It reacts instantly to throttle input, so it may show very low numbers during acceleration or high numbers when coasting. Don’t rely on it for long-term tracking—use the average MPG instead.

Display Shows “—” or “ERR”

If your MPG display shows dashes or an error message, there may be a sensor issue. Check your fuel level sensor or visit a Subaru dealer for diagnostics. This is uncommon but can occur after fuel system repairs.

When to Reset MPG: Best Practices and Scenarios

Knowing when to reset your MPG is just as important as knowing how. Here are some ideal times to do it:

After Every Fuel Fill

This is the golden rule. Resetting after each fill-up gives you the most accurate average for that tank of gas. It’s especially helpful if you’re comparing different fuels (like regular vs. premium) or driving conditions (city vs. highway).

Before a Long Trip

Planning a road trip? Reset your MPG before you leave. This lets you track fuel efficiency over long distances and estimate fuel costs. You’ll also have a clean record to compare against your daily driving.

After Maintenance or Repairs

Had a tune-up, oil change, or new air filter installed? Reset the MPG to see if the service improved your fuel economy. A well-maintained Outback should see a noticeable boost in MPG.

When Switching Driving Habits

Trying to drive more efficiently? Reset the MPG before adopting new habits like smooth acceleration, reduced idling, or using cruise control. After a week or two, compare the numbers to see if your efforts paid off.

At the Start of Each Season

Seasonal changes affect MPG. Reset in spring, summer, fall, and winter to monitor how weather, road conditions, and driving patterns impact your Outback’s efficiency.

Conclusion: Take Control of Your Fuel Economy

Resetting the MPG on your Subaru Outback is a small action with big benefits. It gives you accurate, real-time feedback on your vehicle’s fuel efficiency, helping you make smarter driving and maintenance decisions. Whether you’re trying to save money at the pump, reduce your carbon footprint, or just satisfy your curiosity, this simple habit can make a real difference.

Remember, the process is quick and easy—whether you’re using steering wheel buttons or a trip odometer knob. Just find the right method for your model year, reset after every fill-up, and keep an eye on the trends. Over time, you’ll gain valuable insights into your Outback’s performance and your own driving habits.

So the next time you pull up to the gas station, don’t just fill up—reset that MPG. Your wallet (and your inner car enthusiast) will thank you.

Frequently Asked Questions

How do I reset the average MPG on a 2020 Subaru Outback?

On a 2020 Subaru Outback, press the “INFO” button on the steering wheel until you see the “Avg MPG” screen. Then press and hold the “INFO” button for 3–5 seconds until the reading resets to zero.

Can I reset the MPG while driving?

Yes, you can reset the MPG while driving, but it’s safer to do it when stopped or at a traffic light. Never distract yourself with the controls while actively driving.

Why won’t my Subaru Outback MPG reset?

If the MPG won’t reset, make sure the ignition is on, you’re on the correct display screen, and you’re holding the button long enough. If it still doesn’t work, try turning the car off and on again.

Does resetting MPG affect the odometer?

No, resetting the MPG only affects the trip computer’s average fuel economy reading. It does not change the main odometer, which tracks total miles driven.

How often should I reset the MPG?

For the most accurate tracking, reset the MPG after every fuel fill-up. This gives you a clean measurement for each tank of gas.

What’s the difference between Trip A and Trip B?

Trip A and Trip B are separate trip meters. You can use one for daily driving and the other for long trips. Resetting one doesn’t affect the other, and both can track MPG independently.