Required Fuel Economy Calculator
Required Fuel Economy Calculator. Find efficiency needed for a budget. Enter your values and view the result.
Required Fuel Economy Calculator
Find efficiency needed for a budget.
Use the calculation engine below to model your exact costs with custom fuel prices, distances, and vehicle efficiencies:
Required Fuel Economy 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 Required Fuel Economy Calculator Works
This tool works by solving for the MPG a vehicle needs so planned driving fits a fixed fuel budget at a given price.
- Step 1
Enter planned distance
Type the miles or kilometers you plan to drive each month or year.
- Step 2
Enter the fuel price
Type the expected price per gallon or liter.
- Step 3
Enter the target budget
Type the most you want to spend on fuel in the period.
- Step 4
Read the required efficiency
The calculator shows the minimum MPG and the maximum L/100 km that meet the budget.
Required Fuel Economy Calculator Formula
The formula divides miles by the fuel volume the budget buys.
Fuel Budget Buys = Budget ÷ Price per Gallon
Required MPG = Planned Miles ÷ Fuel Budget Buys = Miles × Price ÷ Budget
Maximum L/100 km = 235.215 ÷ Required MPG
- Required MPG
- = minimum fuel economy that keeps spending within budget
- 235.215
- = conversion factor between US MPG and L/100 km
Worked Example
- A buyer drives 1,500 miles (2,414 km) per month, pays $3.50 per gallon, and wants to spend no more than $150.
- Fuel budget buys = $150 ÷ $3.50 = 42.9 gallons (162.2 liters).
- Required MPG = 1,500 ÷ 42.9 = 35 MPG.
- Maximum consumption = 235.215 ÷ 35 = 6.7 L/100 km.
Required Fuel Economy Calculator Conversion Table
The table lists the minimum fuel economy needed for 1,500 miles per month at $3.50 per gallon across budgets.
| Monthly Budget | Gallons Affordable | Required MPG | Max L/100 km | Vehicle Class That Fits |
|---|---|---|---|---|
| $100 | 28.6 | 52.5 | 4.5 | Hybrid sedan |
| $125 | 35.7 | 42.0 | 5.6 | Hybrid or efficient compact |
| $150 | 42.9 | 35.0 | 6.7 | Compact car |
| $175 | 50.0 | 30.0 | 7.8 | Midsize sedan |
| $200 | 57.1 | 26.3 | 9.0 | Midsize crossover |
| $250 | 71.4 | 21.0 | 11.2 | Midsize SUV |
| $300 | 85.7 | 17.5 | 13.4 | Large SUV |
What is a Required Fuel Economy Calculator?
A Required Fuel Economy Calculator is a vehicle shopping tool that finds the fuel efficiency needed to stay within a fuel budget.
Car shoppers often know their budget and their mileage but not the MPG to look for. The Required Fuel Economy Calculator turns those 2 numbers and the fuel price into a minimum MPG, which narrows the shortlist fast.
The result works as a filter on vehicle search sites. Any model below the required MPG breaks the budget at current prices.
What are the uses of a Required Fuel Economy Calculator?
There are 4 main uses of the Required Fuel Economy Calculator, including car search filters, fleet specifications, and commute planning.
Filter a car search
Set a minimum MPG on vehicle listing sites.
Write fleet specifications
Set a minimum MPG for new fleet purchases.
Plan a long commute
Find the MPG a long new commute requires.
Test price resilience
Rerun the target at higher fuel prices.