Hey Grimace.
Well, i know you want to know about gas milage for those who has broken into their cars. But from my experience with a non-broken into car yet, i can tell you that if you take it easy on the throttle, it's not as thirsty as dpmmsp says it is.
You'll laugh when you read the next line, but i'm still on my 'First' tank of gas! and with over just over 400km on my car, i can say with confidence i can make it to 500km before my low gas light comes on. From idling, regular 'street speed' driving, an highway speed drives, and never going over 4000rpm this car doesn't seem to use any more gas than a regular protege if i were to compare.
On the other hand, i'm sure if you push it from day to day, you'll see the gas guage move to empty in no time. I'm sure it's additive too. I have a good feeling that this car is thirsty on gas if driven in the higher rev range often (over 4000rpm shifts).
Dpmmsp, when you gases up, what kind of gas do you use?
Are you using the highest octane you can find? Sunoco Ultra 94? I plan on using that for my 2nd tank of gas.
Grimace, if you're looking for # of gas milage to the gallon, i don't know anyway to tell you the exact #.