Does this work with the MS6 too? I've looked at all the common risk factors (tire pressure, oil, air filter, etc.) and couldn't find anything. Hmmm.
I live in a small town. If I accelerate too quickly, I'm already outside city limits.
edit:
how would I find out if my car has had its reflash?
I'm getting 22 city and 26 highway right now. In the summer I typically get 26 city and 33+ highway. It's all in how you drive. You definitely need to pay attention to where you get your gas though. Look for places with above ground tanks (you'll know them when you see them). You may also need a fuel filter change.