[maddogsvolusia]

I just replaced all 4 of my O2 sensors trying to get out of the mixed driving 13s in my 2wd with 265/70/17 Bridgestone Revos. (The front Driver's 02 was a nightmare by the way! Galled threads had to be destroyed and retapped!) Anyway, no improvement. I use a K&N air filter, Synthetic oil, and recently tried NGK V-groove plugs. I also run Primrose injector cleaner in every 3000 miles. I keep the tire pressure at 38 to 40 PSI. My next step is synthetic in the transmission and differential. I seem to have plenty of power, I just can't break 13 mpg in mixed driving or 15 mpg highway. It's not terrible for how nice it rides and all the space, I would just like to do a little better. My 12 gallon car can drive farther on a tank of gas than my 26 gallon Sequoia. hehehe