That's probably a good guess on MPG. I get around 14-15 as an average and on long highway road trips get as much as 19mpg on my 2006 GT. The 2-3 yrs I've owned it have been fairly trouble free, except for some water in the trunk, due to clogged drain lines and having it parked outside for a few weeks when my garage was being used to store stuff.

Same thing happened to my audi q7, taking out the amplifier. Poor design by VAG on all counts, and apparently a problem with several other cars they design/manufacture.

As such, I'd recommend checking under the spare for any coupes you might be interested in and if parking outside in rain, I'd recommend maintaining these drains with some nylon trimmer (weed whacker) string or other.