I drive conservatively and get 18-20 mpg with a third/two thirds highway/city mix. The city driving is hard core too because in 10 miles one way to work there are at least 18 stoplights and in San Diego you WILL wait at every light. Conservative highway cruising using 92/93 octane I've gotten 26-28 mpg and maybe a tad more, and this is doing 70-75 mph. With 91 octane I get around 24-25 mpg in So. Cal traffic.

Like another forum member, it seems that my mpg has increased with the Needswings intake but I haven't done any formal calculations yet.