Mixed Driving Fuel Calculator
Mixed Driving Fuel Calculator. Combine city and highway consumption. Enter your values and view the result.
Mixed Driving Fuel Calculator
Combine city and highway consumption.
Use the calculation engine below to model your exact costs with custom fuel prices, distances, and vehicle efficiencies:
Mixed Driving Fuel Calculator: inputs
Adjust sliders or enter exact figures
Monthly Fuel Budget
Real-Time Visual Breakdown
Comparing your expense against alternative vehicle classes
Price Fluctuation Stress Test
See how unexpected gas price surges would impact your monthly budget
How Mixed Driving Fuel Calculator Works
This tool works by blending city and highway fuel economy by the share of miles driven on each road type, using a harmonic average.
- Step 1
Enter city and highway MPG
Type both ratings from the window sticker or fueleconomy.gov.
- Step 2
Set the city share
Enter the percentage of miles driven in the city. The US Environmental Protection Agency (EPA) combined rating assumes 55% city.
- Step 3
Enter distance and price
Type total miles or kilometers and the fuel price.
- Step 4
Read the blended result
The calculator shows the blended MPG, the fuel used, and the total cost.
Mixed Driving Fuel Calculator Formula
The formula uses a harmonic average, which weights fuel used per mile rather than MPG values.
Blended MPG = 1 ÷ (City Share ÷ City MPG + Highway Share ÷ Highway MPG)
Mixed Fuel Cost = (Total Miles ÷ Blended MPG) × Price per Gallon
- City Share
- = fraction of miles driven in the city (0.55 = 55%)
- Highway Share
- = 1 − City Share
Worked Example
- A car rates 25 MPG city and 34 MPG highway and drives 55% city miles.
- Blended MPG = 1 ÷ (0.55 ÷ 25 + 0.45 ÷ 34) = 28.4 MPG (8.3 L/100 km).
- A weighted arithmetic average gives 29.05 MPG, which overstates real economy.
- Mixed fuel cost for 1,000 miles (1,609 km) at $3.50 = $123.32.
Mixed Driving Fuel Calculator Conversion Table
The table shows blended fuel economy and cost per 1,000 miles by city share, for a car rated 25 MPG city and 34 MPG highway at $3.50 per gallon.
| City Share | Highway Share | Blended MPG | Blended L/100 km | Cost / 1,000 mi | Cost / 1,000 km |
|---|---|---|---|---|---|
| 0% | 100% | 34.0 | 6.9 | $102.94 | $63.96 |
| 20% | 80% | 31.7 | 7.4 | $110.35 | $68.57 |
| 40% | 60% | 29.7 | 7.9 | $117.76 | $73.18 |
| 55% | 45% | 28.4 | 8.3 | $123.32 | $76.63 |
| 70% | 30% | 27.2 | 8.7 | $128.88 | $80.08 |
| 85% | 15% | 26.0 | 9.0 | $134.44 | $83.54 |
| 100% | 0% | 25.0 | 9.4 | $140.00 | $86.99 |
What is a Mixed Driving Fuel Calculator?
A Mixed Driving Fuel Calculator is a fuel cost tool that combines city and highway consumption into one blended figure based on how you drive.
Few drivers match the 55% city and 45% highway split behind the EPA combined rating. A suburban commuter on the interstate drives mostly highway miles, and a downtown resident drives mostly city miles. The Mixed Driving Fuel Calculator uses your own split for a closer estimate.
The harmonic average matters. Averaging 25 and 34 MPG directly gives 29.5 MPG at a 50/50 split, while the correct blended figure is 28.8 MPG.
What are the uses of a Mixed Driving Fuel Calculator?
There are 4 main uses of the Mixed Driving Fuel Calculator, including personal MPG estimates, vehicle comparison, and budget accuracy.
Estimate personal MPG
Get a blended MPG that matches your own city and highway split.
Compare vehicles fairly
Rank cars on your real driving mix, not the EPA mix.
Improve budget accuracy
Use the blended figure in monthly and yearly budgets.
Plan a move
See how a move from suburb to city changes fuel use.