Originally Posted by TooTall
I think I have a new problem. I recently took a 400 mile trip and could not get over 36.6 mpg. I had taken the same trip twice before the TSB upgrade and managed an easy 40 mpg with speeds of 65 - 70 mph.
I'm now wondering if anyone else has seen a drop in mpg after the TSB upgrade?
Is this based on the dash or actual measurements/fuel-ups? Lots of things can effect fuel consumption. Considering they haven't changed your gears themselves, once the car is in 6th gear, the output ratio will not change. This may effect your city gas mileage slightly, but not highway. Note that engine load will effect gas mileage more than RPM (though, a higher RPM will have more friction, and thus increase consumption). Ford hasn't changed the EPA estimates after the update, so I think any issues you are seeing are coincidental.