![Frown](https://fordfestiva.com/forums/core/images/smilies//frown.gif)
So from what I have learned, changing to a Denso o2 Sensor, and a two stage thermostat actually made zero difference in gas mileage.
Before I changed both of those, my highest was 36MPG, with a Bosch o2, and a single stage thermostat.
C'mon car, I put a 40MPG sticker on the rear window, are you going to make a liar out of me!?
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