Ok on my 75 mile drive to work, I got 26.5mpg@75. I got better as I drove. So it looks like the ecu reset did the trick. I suspect the issue was that the default(or starting point) of the ECU is closer to the new parts I installed. With the old O2 and plugs it must have had it doing major compassion.

Doug

 

Hey man one thing I hadn't thought about. When you get bigger wheels, it'll screw with your speedometer. That could be messing up the MPG that you're seeing on the display. Try taking the miles you drove and dividing them by the gallons you put in next time you fill up.

 

I run 18.5 mpg on average... I certainly don't baby the throttle, I'm addicted to listening to the CAI and custom exhaust at WOT... So, if you drive hard everyday, it would be normal... However, if I ran on cruise control I imagine it should be better...