I expect using present technology the result would result in lower gas milage.
From the economist.com
Government figures show a drop of at least 20% in milage covered since the mid-80s.
From the bbc.co.uk
Also any motorist knows the type of driving count more than the milage.
From the guardian.co.uk
On board playback sees about 8 hours although your milage may vary.
From the techcrunch.com
A Fiat 850 in a milage contest got 55 mpg.
From the guardian.co.uk
I drove over 200 miles on an 80% charge, mostly at quite high speeds, and knew exactly what my landing milage would be.
From the economist.com
UberCab calculates the cost of your trip based on milage and time in the car, similar to the way other limo companies calculate fares.
From the techcrunch.com
The limited milage currently available, coupled with the lengthy recharging time, means some initiative is required to overcome these shortcomings.
From the guardian.co.uk
This Fusion hybrid looks almost identical to its non-hybrid counterparts, but easily gets great gas milage while sporting a look most will find acceptable.
From the techcrunch.com
More examples
Mileage: distance measured in miles
Fuel usage in automobiles refers to the relationship between distance traveled by an automobile and the amount of fuel consumed. ...