MPG (Miles Per Gallon) Calculator
Calculate fuel efficiency, track fill-up history, and estimate trip costs. Features MPGe support for EVs and a savings projector.
Fuel Needed: 0 gal
Annual savings (12k miles/yr): $0.00
| Date | Dist | Vol | MPG | Cost |
|---|
About
Tracking fuel efficiency offers immediate insight into engine health and driving habits. While modern dashboard displays provide estimates, they often rely on short-term sensor data that fluctuates with idling or sensor drift. Calculating Miles Per Gallon (MPG) manually using odometer readings and pump receipts remains the gold standard for accuracy.
This tool addresses the discrepancy between manufacturer ratings (EPA/WLTP) and real-world performance. Variations in tire pressure, aerodynamics, and cargo load significantly alter consumption. For fleet managers and commuters, a deviation of 2 to 3 MPG represents a substantial annual financial variance.
We include specific modules for Electric Vehicle (EV) equivalents using the MPGe standard, allowing hybrid owners to compare efficiency directly against internal combustion engines. The integrated logbook persists data locally, enabling the calculation of a running average that smooths out anomalies from single tank fills.
Formulas
The core calculation relies on the differential in odometer readings divided by the fuel volume required to refill the tank. Accuracy depends on filling the tank to the same level (usually the automatic click-off) each time.
For Electric Vehicles, the MPGe (Miles Per Gallon equivalent) is derived using the EPA standard where 33.7 kWh of electricity contains the energy equivalent of one gallon of gasoline.
Reference Data
| Efficiency Class | MPG (US) | MPG (UK) | L/100km | Cost/100mi ($3.50/gal) |
|---|---|---|---|---|
| Heavy Duty / Towing | 8 | 9.6 | 29.4 | $43.75 |
| Full-Size SUV | 15 | 18.0 | 15.7 | $23.33 |
| Average Sedan (2010s) | 25 | 30.0 | 9.4 | $14.00 |
| Modern Crossover | 30 | 36.0 | 7.8 | $11.67 |
| Compact / Economy | 35 | 42.0 | 6.7 | $10.00 |
| Hybrid (City/Hwy Mix) | 50 | 60.0 | 4.7 | $7.00 |
| PHEV (Gas Mode) | 55 | 66.1 | 4.3 | $6.36 |
| Electric (MPGe Low) | 90 | 108.1 | 2.6 (eq) | $3.89 (eq) |
| Electric (MPGe Avg) | 110 | 132.1 | 2.1 (eq) | $3.18 (eq) |
| Electric (MPGe High) | 140 | 168.1 | 1.7 (eq) | $2.50 (eq) |