Honemch- Ah ha! Thanks for that information and that would be entirely plausible. Wow our EV use is a much higher percentage of our "normal" use than I was expecting. The bad news is that our ICE is only getting: (1706-1091)/25.5= 24.11 MPG. Hopefully the low MPG will improve after break in. What about the 223 Kwh, that shows in the display, is that a rollover number also?
If the 223 Kwh + the 25.5 gallons is the actual energy that the car used to go 1706 miles here is what I come up with:
The Ge (gas equivalent of the Kwh) = 223/32.8 = 6.8 Ge
The MPGe for the car is 1706/(6..8+25.5)=52.8 MPGe
So if Fuelly had a way to enter the Kwh and let you select gas type (so it could do the proper Ge conversion) then add that to actual gallons of gas consumed and divide the total into the miles traveled and report the number as MPGe I would probably be on board with Fuelly.
BTW-It should be noted that actual ICE MPG is probably better than calculated since, IMHO, some of the EV miles are actually miles created using potential resulting from ICE operation. Never the less the total MPGe is what it is based on total Energy consumed by the car to get the miles traveled by the car.
Soap Box Statement : IMHO the "value" in sharing MPG and MPGe, with others, is to help them make an informed decision on a potential purchase. If the potential buyer is just looking at gas savings possible then the major factor they must include, when considering a PHEV over a HEV or ICE, is what percentage of their use of the vehicle will take advantage of the EV part. Perhaps a good "normalizing" factor, in a Fuelly report, would be a percentage of ICE or EV use for the miles being reported. In my case it would be (1706-1091)/1706 * 100 = 36% total miles traveled were ICE miles.
Edited by Don, 25 February 2013 - 10:45 AM.