With 19 we are doing well? 19? We are getting about 10 mpg!. I was hoping to maybe hit 13 in a combo of city and highway driving? He doesn't get on the gas much, he also realizes that gas prices have spiked and the first hour he is working on the job is just to pay to fill the tank from the cost of getting to work and back.
We use standard non-premium gas I think it is 87 octane but in MI they put ethanol in everything.
Was hoping a new fuel filter might help fuel get there more efficiently.
Would a throttle body spacer help at all with mileage?
also bought the truck with a new dual exhaust. It comes right off manifolds on each side and joins in a Flowmaster 40 muffler. The stock cats were empty or disintegrated and were not replaced. The truck is running without its (single) O2 sensor which was precat I'm told. I hope to weld in high flow cats one on each pipe and one of the 2 will have a bung to allow the O2 sensor to reattached. Perhaps that will help a bit?
I'm pretty sure your O2 sensor is the issue. In my experience O2 sensor problems make the engine run rich and waste gas.
Back when I had 33s, 3.42s and no lift I was getting 13-14 mpg. If I remember right I lost about 1-2 mpgs going from a 285 A/T tire to a 12.50 M/T tire for what it's worth. This was all tank average at the pump but more highway than city most of the time.
Now I get 10 mpg but that's rolling on 37" M/Ts with 4.88 gears, 6" lift, a full toolbox, winch, etc. I dip into the single digits city driving. If you're going to burn gas you might as well make the most of it right?
The dual exhaust and big (heavy) wheels aren't helping either, taxing the engine every time you take off from a stop. The 305 needs all the help it can get.