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My truck is an 1987 F250 with a 302, 4 wheel drive, automatic, new plugs, new wires, new distributer cap, new rotor, and the timing is set at 10BTC. Empty, at 65 mph, I get 10 miles to gallon on the highway. I need to tow a 29 foot camper 1800 miles. HELP!
You will not get much better than that. I recently rebuilt my 90 f150 302 4x4 engine, replaced computer and just about all the sensors. I installed an electric cooling fan. I have oversided tires, but matched the gears to the tires. It gets 12.5 - 13 on the road with overdrive and maybe 10-11 in town. Are your tires factory or larger? Larger tires will show worse gas mileage. Divide your new tire height by factory and then multiply mpg to get the actual mpg. Also, do you have a c6 or AOD tranny? I would imagine that the c6 would be worse gas mileage because of no o/d. For towing, you need to use drive and not o/d anyway. If you get 8-10 with the camper, you will be doing good. A guy that works with me gets about that with his 2001 Expedition pulling his travel trailer.
Run the codes and see if there is a problem indicated. The engine light does not always come on when codes are present. Bad O2 hurts mpg, but computer should indicate that.
My F250 with 460 4.10 gears and E4OD gets 11.5 to 13.5 empty on the interstate at 75 mph on cruise control. Seems like a 302 should do a little better. The weight and power requirements are about the same so the fuel consumption won't be much different.
Be sure some trailer brakes work on that camper. Have fun, I'm ready for another road trip.
The transmission (3 or 4 speed auto) and gearing can make a huge difference in your gas mileage. Any idea what is in yours?
Also, check to make sure the exhaust is not restricted. A plugged cataletic converter can really drop the mpg. Also check the air cleaner, you did not mention it in your previous post.
Also, is the truck lifted or anything like that? If it is up in the air, it pushes more....hence more resistance.