From when my low fuel light goes on, to fillup, one click on the pump, is 19.7 gallons on my '97 3.4 4 x 4 automatic. This particular tank I got 248 miles. A whopping 12.6 mpg! I did two highway runs. One was 77 miles, the other 43. The rest were local short trips. Warmups in the a.m. were about 3-4 mins. I'm easy on the pedal, really. Just before this last fillup, I swapped out both 02 sensors. The plugs have 20K miles on them. The truck runs like a top. I haven't cleaned the MAF. It's the jet engine type with the sensor riveted in. Since I'll have to blindly flood the tube with cleaner, I've been reluctant. Mostly because, when I do it, I'll want to let it dry out for a few hours before I reinstall it. I just haven't had the time. Could a dirty MAF be what's killing the MPGs? A dirty throttle body? Do the 02 sensors need to break in, or does the ECU have to adjust to them ? The tires are stock Michelin LTX MS @ 34lbs. The last tank was 91 octane. I just refilled with 87. Maybe that'll help?

Any thoughts? <img src="/forums/images/graemlins/confused.gif" alt="" />