hmmmm well the reson why your MPG went up with the intake... beter flow! wooo
but yeah, im not sure about the shift light deal, the reason for this.... the shift light is not for MPG, but for imensions (sp) a really funny thing i saw was a grapgh on i tihnk it was air intake and you can tell that the ECU is programed to get better imesions at the shift range.
so the shift light isnt really ment for effincy, i cant rember where i saw this grapgh, but it was on a focus sight somehwere..... kinda proof of this.... when the car makers do the emisions tests, it only bewteen a range of rpm they say, so they kinda cheat and the ecu's are programed to get good emisions at that range, where its at, i dunno, but im guessing its where the car tells you to shift.......
antwho, everything is good if your getting good gas milage!!!
oh dont wory bout having problems with the geting words out, i have that same problem from now and again... lol so its all good!