PHEV Fuel Economy Calculator

Ecology

PHEV Fuel Economy Calculator estimates fuel efficiency combining electric and gas usage. Combined MPGe = (miles_electric × MPGe_equiv + miles_gas × MPG) / total_miles.

Formula

Combined MPGe = (elec% × MPGe) + (gas% × MPG)
  • MPGe = miles per gallon equivalent
  • Assumes 33 kWh = 1 gallon gas energy
  • PHEV efficiency depends heavily on driving patterns

PHEV Example

Inputs
  • Miles on Electric (per 100 miles): 40
  • Gas Engine MPG: 30
  • EPA MPGe (electric equivalent): 110

40% electric @ 110 MPGe + 60% gas @ 30 MPG = 62.4 combined efficiency

Frequently asked questions

What is MPGe?
Miles Per Gallon equivalent—EPA standard for comparing electric to gasoline efficiency
How does PHEV efficiency work?
Combines electric-only driving (zero gas) with hybrid gas engine for longer range