I paid $1.88 for 93 this morning (then I'll get 5% back from Shell). Haven't done the math on the last tank yet.

I would't expect to get 5-7 mpg increase from the chip and air filters. More efficient engine operation resulting in improved fuel economy yes, but I don't know that you'll get that much.

I personally for the pure tecno-gook in me would like to know all the answers to your questions too. :wink: But I think Upsolute themselves will have to answer to that techie level. Or perhaps read some of the techie details on the various chip sites (google for 'performance chip').

Although Wes IS the aero engineer :P , me I just do command systems for submarines... 8)