Fuel Log Calculator

Tracking your vehicle's fuel efficiency fill-to-fill is one of the best ways to catch engine problems early or gauge the real cost of every drive. Enter your starting and current odometer readings, fuel added, and price per gallon into the Fuel Log Calculator, then select your unit system (US, Metric, or Imperial) to get your Miles Per Gallon (MPG). Secondary outputs include trip distance, fuel cost, cost per mile, and an efficiency rating for your vehicle.

miles

Odometer reading when you last filled up

miles

Current odometer reading

gallons

Amount of fuel added at current fill-up

Current fuel price per gallon

Results

Miles Per Gallon (MPG)

--

Trip Distance

--

Fuel Cost

--

Cost Per Mile

--

Efficiency Rating

--

More Automotive Tools

Frequently Asked Questions

How do I calculate my vehicle's MPG accurately?

Fill up your tank completely and record the odometer reading. Drive normally until your next fill-up, then record the new odometer reading and the amount of fuel added. Divide the miles driven by the gallons used to get your MPG.

What's considered good gas mileage?

Good gas mileage varies by vehicle type. Compact cars typically get 25-35 MPG, mid-size cars 20-30 MPG, SUVs 15-25 MPG, and trucks 12-20 MPG. Hybrid vehicles can achieve 40+ MPG.

How can I improve my vehicle's fuel efficiency?

Maintain steady speeds, avoid rapid acceleration and hard braking, keep tires properly inflated, remove excess weight, and perform regular maintenance like oil changes and air filter replacements.

Why does my MPG vary between fill-ups?

MPG can vary due to driving conditions (city vs highway), weather, traffic, driving habits, vehicle maintenance, and fuel quality. Track multiple fill-ups for a more accurate average.

Should I track fuel economy over time?

Yes, tracking fuel economy helps identify trends, detect potential vehicle issues early, budget for fuel costs, and evaluate the effectiveness of driving habit changes.

What's the difference between city and highway MPG?

Highway MPG is typically higher because constant speeds are more efficient than stop-and-go city driving. City driving involves more acceleration, braking, and idling, which reduces fuel efficiency.

How accurate are the EPA fuel economy ratings?

EPA ratings provide standardized comparisons but real-world results vary. Your actual MPG depends on driving habits, conditions, vehicle maintenance, and other factors not captured in lab testing.