Im gettin horrible gas mileage on my 1991 f150 with a 302. Iv changed the plugs and wires cap and rotor ..air filter..oil..it has long tube headers with glasspacks ..i think Im gettin some where between 8-9mpg

 

How does the engine run? Check to make sure you did not cross any of the wires when you did the tune up.

 

Seafoam it....Through the brake booster vacuum line....It'll clean any gunk off the injectors....

 

The engine runs strong for having almost 200,000 miles on her. Every so often something will break but I fix it. Im wonderin if the timing could be off?

 

Subscribing to this thread. Maybe I'll get an idea abou my own fuel guzzling.

 

We need more info here. What transmission, gears, and tire size are we dealing with here? Two or four-wheel drive? What type of driving do you do (city/hwy)? Do you regularly make short trips (10 miles or less)? When was the O2 sensor last changed? Any exhaust leaks?

 

the gears are stock ...two wheel drive on 31s which I no bigger tires less mpg but there not tht big. I mostly jus around town driving. There is an exhaust tick which I think is from the header cause there is 2 factory strips in the passenger side head. The o2 sensor is on my header because I have tooken the cats off.

 

There were a number of gear ratios available from the factory. City driving and short trips will hurt your mileage. The exhaust leak will effect the O2 reading, which will effect your mileage as well. The O2 sensor is fine in the collector of the header, but if you've never replaced it, it would be a good idea to do so.

 

Dual tanks or single? If it's dual do they both work? And If so do they both return the same MPG?

 

Dual tanks ...my front tank does not rejestor so I use the back

 

.. Hmm, my 96 does about 8.5-9 mpg when I hot rod around showing off exhaust, if I drive like a sensible person, (grandpa) I get 12-13.. Driving style effects these trucks (or mine) terribly..

 

wow your truck is really wonkey, hotrodding for me gets me about 10 - 13 MPG and sensible driving (never going over 55MPH gets me close to the 13 - 15 some times 17 range (thats really pushing it tho lol!!!

 

Hmmm.....My dads' 92' XLT (302/5speed) gets EXACTLY the same MPG's as my truck (300/5speed).....

We both get 13-16 city-wise, and 18-20-ish highway...

Both are 2wd, longbed/standard cab,with 3.08 rear gears....

So yea....No one will EVER tell me that a 300 can't get as good as MPG as a 302, or vice-versa.....

 

i have a 302 in mine and im getting about..ehh...10-12 on city and about 15-17 on highways depending on the wind haha. the camper top effects the gas mileage on really windy days. i dunno my gear rating but i do have a 4x4 with an E4OD somaybe someone could clue me in?

 

Punkandpissed: I think its the gas in Ga lol... I think all the indians are pissing in their tanks and selling it to us..