scan gauge does have average mpg in witch reset with every fill up.
as far as your MPG, remember your Generator uses gas also. you need to estimate how long you ran it and subtract that from the gas used on the trip. (for example my 4K onan uses roughly .12 gallons at idle /no load, .5 gallons at half load, and 1 gallon at full load per hour.) if you have your AC running with the gen running. caulate .5 x hours ran. subtract that from the gas the gas pump says and youll get your actual motor MPG. (or just dont run the generator)
this is where the scan gauge gets confusing. all it knows is what the engine is using. if the generator is running at all it will foul up the MPG unless you calculate it yourself. this is of course solved if you have a separate gas tank for the generator.
if you have the E3/450 you can mount it in the pocket on top of the dash with some dremel-ing. my install below
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