'91 Miata with a full replacement ECU (i.e. I can set my own A/F ratio - no need for even an O2 sensor). I have detailed a few of the changes I have made to the car here:
http://www.lightweightmiata.com/mpg/index.htm
Anyway, the big changes so far have been to driving technique, pumping tires up to 50 PSI, and changing the A/F to 15:1. I've increased my MPG from 20 (a very rich mixture with a supercharger) to 35. I've been at 35 for the past few weeks even though I have:
- changed from 10W-30 to 0W-30
- dropped my A/F ratio down to 15:1
- changed from a 180 to 195 degree thermostat
Anyone have a good idea on where to go from here. I'd like to try a partial grill block next but I was really hoping to hit 40 MPG on this last fill up. I really leaned the mixture out (and the car feels kind of jerky at times) and thought I would see some good results but I didn't. Help!
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