You can expect to get about 448 Miles on a tank of gas with mixed city/hwy, that's about 16+ mpg driving if not better with discipled driving as @marctronixx mentioned. A CAI will be a great upgrade to the current air filter system. I just did my first cleaning on them after 100K.Thanks for the advice. I appreciate it. I wasn't really looking for something like this, but boy am I happy I did! Has 100K on it and got it for a great price. No accidents and a very long service record, so I know it was well maintained. Plugs are every 50- 60 thousand miles? I know air filters are 7-8 thousand, which seems overly frequent, but I'll still do it. I try real hard to not get on the accelerator, but it's SO nice. I'm enjoying it tremendously!!