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Specs: 1989 F150 Lariat with 5.8 liter (351) with three speed automatic (no overdrive) and EFI. 94,000 original miles. Runs fine, with a slight rough idle. Horrible mileage, maybe due in part to the three speed automatic. My question to the forum: what's the most efficient and economic way to improve the gas mileage? What's the best bang for the buck?
Nothing. We all are suffering due to the garbage the feds are making gas companies put in their fuels, such as methanol which burns twice as much as gas, a couple things you can do, but it will cost you, put higher gears in but towing will be affected, full headers and duals, try new o2 sensors, but other than that there is no true way to get better mileage out of a 351\c6,
"Its a Ford. Nuff said. Everything else is just a glorified tonka toy"
"ASE" Certified" Parts Professional
92 F150 302 4x4 Long bed Extended cab
2001 Taurus wagon
My truck is a 1990 with the 5.0 in it, but it should still be applicable. This is what I did to mine and I noticed a pretty good increase in mileage.
-Electric Fan Upgrade
-Accel Distributor Cap/Rotor
-Accel (or equiv) Spark Plug Wires
-Bosch Platinum Plus Spark Plugs (Platinum Electrode = Hotter Spark)
Note: If you run a "hotter" ignition coil, you can open up the gap on your spark plugs to allow a larger spark, which should give you a more complete burn.
-Accel or Jegs Ignition Coil Upgrade
-3G Alternator Upgrade
-Synthetic Gear Oil (75w-90 if you tow occasionally and 75w-140 if you are towing frequently)
-High Flow Air Filter
-Quality Motor Oil (5w-30 is optimal for mileage)
-Fresh Transmission Fluid
-Double Check Ignition Timing
-Obvious stuff like make sure your tire pressure is correct
-New O2 Sensor
i have an easy way to improve gas mileage...
take a 3/4 inch dowel rod, measure it about 3 inches and cut it. place it on the underside of the gas pedal and secure it with a good ole wood screw skinny part against the gas pedal.
'Confucius says,"Those who do not use a jack stand shall become a jack stand."'
"9 out of 10 men prefer a woman with big breasts, the 10th prefers the 9 guys"
"Im just kinda retarded like that"
1989 F-150 L.W.B. Reg. Cab 5.0 (ole red, the tank)
Sorry folks have a 89 5.8/351 in my Elite motorhome and am lookin for ideas to improve the stock 3 speed transmission as well as mileage some good ideas from qdeezie as i have set aside 2 grand before the alberta spring rving/rodeo season.Thanx