6SpeedTA95

Hey guys I was hoping to find out what kind of MPG's you guys are getting in your cars. Within the next year I'm strongly considering picking up an SI sedan or perhaps a Mazda3. But honestly I'm leaning against the Mazda3 because they do not get very good mileage. The Civic SI seems to get better mileage from all the reports I've read. I'm also considering a few higher end cars like used BMW 328i or perhaps a newer G35 but there are problems like more expensive maintenance with those cars that is not attractive since we'll probably be having kids in the next few years. As a result I'm starting to lean more towards something like a Mazda3 hatch or an SI Sedan that will have some room and be fun as hell to drive while also being reliable and taking an occassional track beating.

What kind of MPG do you get? what is your city/highway split and I assume everyone is running premium in these cars?

R_Squared

2007 Si Sedan

60% city/in-town driving 40% highway

I usually average around 26 mpg on 93 octane premium. I'm sure if I tried a little harder I could get that up to 28 or so.

Maiku

I've never gotten worse than 27mpg but I average 29mpg and occasionally get up to 31mpg.
I fill up when almost empty. I drive about 70% city and 30% highway on a daily basis.
Your only supposed to run premium in the Si. Otherwise it can cause pinging and power loss. Not sure if it would effect MPG though.

TEGadactyl

You really cannot go wrong with either the m3s or the si, I would avoid the used bmw/g35 unless you go certified pre-owned with a maintenance insurance policy or something, but it is up to you!