at 118,000 I noticed a drop in gas mileage; I'm averaging 15 mpg, down from 18-20 mpg. I had the computer scanned at the Ford dealer, no problems; the tires, pcv valve, oil, etc; has all been changed. it seems like the rpms are higher now than what they used to be, for instance, at 65 mph the rpms are 2600; i thought they used to be around 1800. transmission seems to shift, manually and automatically okay, I just can't explain the drop in gas mileage. the only changes I've made is having the heater on, all the time, and I took the tonneau cover off. that shouldn't account for a mpg drop should it?
Jan 21, 2008 at 5:33 AM