% Over EPA Frequency Distribution
 

Was curious what the spread of the percentage over EPA data would be in the garage. The mean value is 20.52% and the standard deviation is 23.62%. Frequency counts are of the data rounded to the nearest percent.

https://www.fuelly.com/attachments/fo...2f46b90c92.jpg

Hard for me to say. Neither of mine have EPA/EIA/CAFE/whatever the hell acronym ratings...

Percent over WHAT EPA? OLD, NEW, CAFE? Which one???

That's not very useful because the "EPA" values people put into the garage for their vehicles isn't consistent and sometimes are downright lies and or fooling around.

Yes, but it's the data I had available to me.

Well I'm glad, since the chart shows gasoline powered cars only, that you weren't making personal reference to me. ;)
I specifically asked before entering the engine swap white wagon (Kyoto Camel too) which EPA rating I should use: the gasoline one as the car was built, or a diesel one as I re-constructed it. The advice was to use the gasoline value. No lie, and no fooling.
That one is now retired, but I'm building another conversion and that one will also be listed here under its original gasoline, "as-built" condition using the current EPA value.

Theoretically (albiet time consuming) you could collect the MPG from readings from people(via the website), the EPA MPG ratings for their vehicles(from fueleconomy.gov) and then calculate it.

Eh, that's stupid. If there is an EPA rating for the engine you're putting in, then I'd take the EPA rating from the car it was once in and use that as my basis for calculation. I mean sure things can get sticky when you're taking a diesel engine from a really unaerodynamic vehicle and putting it in a slow aerodynamic vehicle where you don't know where to attribute what to what but aside from that, if you're putting an engine from a car that clearly gets better mileage into your car which gets less mileage, then it is only fair to use the rating from which you stole the engine from. i.e. if I take an engine from a Civic VX and put it into a Civic Sedan, I should use the VX rating when calculating my MPG rating.

I'd say the whole point of any of these modifications is that we end up with vehicles on the whole with better, not worse mileage. IMO if you're going to swap in an engine, take an engine that was dumped out by its owner (unwanted) opposed to taking an engine from a perfectly working and efficient car and putting it into your less efficient.

Even better, you could do it! :)

Ummm so when I swap the 3.0V6 that's in Marvin for the rebuilt spare 3.0V6 that happened to come out of a (junked) Dodge Shadow rather than a minivan, I should go by the car's EPA figures?