I would say what the database has is typical. Only a small minority are extreemists as far as MPG goes. Remember, reports such as consumer reports and edmunds are reporting just one tank from one driver probably in one location. How accurate do you think those numbers are?

I think the database here shows the whole spectrum and the average is probably right on. Now, if they ever do a sort by zipcode on the database you might be able to get a closer average to what you can expect in your area.

My hydroponics experiment

You ever notice how hard it is to lip read cartoon characters?
"Crazy is what the sane call Delta Flyer"