How to Calculate MPGe vs. MPG

November 15th, 2013 by
Plug-In Hybrid

The 2014 Accord Plug-In Hybrid enjoys a 124 city / 105 hwy MPGe rating.*

It’s no secret that vehicle gas mileage is a supremely important selling point for many cars on the market today. Here at Fisher Honda in Boulder, we’re very proud of the high fuel-efficiency ratings our current Honda models offer. For many customers looking to drastically decrease the amount of time they spend at the pump, a hybrid Honda vehicle is an ideal choice. However, fuel efficiency for hybrid models is calculated via miles-per-gallon equivalent (MPGe) instead of MPG. So how is this equivalent number calculated differently than normal MPG? First, let’s explore how a vehicle’s fuel efficiency number is obtained.

MPG and MPGe Testing

In order to find out how many MPG or MPGe a car gets, it must first undergo a series of tests by the Environmental Protection Agency, or EPA. Over the years, the EPA has shown that gas-powered vehicles receive a higher MPG on the highway than in the city, while electric and hybrid vehicles actually get better mileage ratings in stop-and-go city situations. Models manufactured in 2008 and later undergo tests with five different factors in a controlled environment. However, the EPA only tests about 10% to 15% of all models in production, so automakers are trusted to provide their own honest results. But, the EPA does make an exception for electric vehicles and plug-in hybrids, as they test every new EV and PHEV on the market.

What’s the Difference Between MPG and MPGe?

A vehicle’s MPG rating is fairly self explanatory. It’s the number of miles your car can drive per gallon of gas. Figuring out an MPGe rating is a little more complicated. Since engines that use an alternative source of fuel can’t be measured by liquid gallons of fuel, the MPGe rating is calculated by figuring out the number of miles a vehicle can go using the same energy content as a gallon of gas. The EPA calculates that 33.7 kilowatt-hours of electricity is the equivalent to one gallon of gas, so an electric or hybrid vehicle that uses 29 kWh per 100 miles would get a combined 115 MPGe rating.

Spend More Time Driving and Less Time Filling Your Tank

If you’re interested in exploring our selection of hybrid Honda models, feel free to contact our sales associates at (866) 826-7340 to schedule a test drive! Otherwise, visit our dealership at 6025 Arapahoe Road in Boulder to browse our showroom at your convenience.


*115 combined miles per gallon of gasoline-equivalent (MPGe) electric rating; 47 city/46 highway/46 combined MPG gasoline only rating. 13 mile maximum EV mode driving range rating. 570 mile combined gas-electric driving range rating. Ratings determined by EPA. Use for comparison purposes only. Your MPGe/MPG and driving range will vary depending on driving conditions, how you drive and maintain your vehicle, lithium-ion battery age/condition, and other factors. For additional information about EPA ratings, visit