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94 l6 bad fuel milage

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Old 02-05-2013, 03:22 PM
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They shouldn't be that unless you put different gears in the diffs. Stock should be 3.08 3.55 and 3.73 if you lucky

Last edited by rusty84f-150; 02-05-2013 at 06:10 PM.
Old 02-06-2013, 09:47 AM
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look in the owners manuals they but 4.10s behind the 4.9 if they are 4.10 that is were your problem is mt 92 with e40d and 3.08 will get an average of 22 mpg
Old 02-06-2013, 01:15 PM
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That's not true for all of them my truck is a 4.9 And it has 3.55s same as my last f150
Old 02-06-2013, 05:55 PM
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Yeah, I just crawled under her and its got 3:55
Old 02-07-2013, 09:47 AM
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right yours has 3.55s. mine has 3.08s but you could also get em with 2.73 and 4.10s it was just an option
Old 02-08-2013, 07:28 AM
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Yeah mine has 2.73 and still has bad gas mileage. Haha like I said I have issues
Old 03-06-2013, 01:55 AM
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Well guys its been awhile sense I last posted in here I've done wires plugs coil and timing at 14 base and including what I did when I first posted this thread. Can I say I'm stumped I don't know what what else to do I'm averaging 11.5 mpg's. I've checked for codes and got none I've changed the way I drive the truck nothing changed in the mpg area. No vacuum leaks either. What else could I be missing? Any ideas will be greatly appreciated thanks in advance.
Old 03-06-2013, 09:39 AM
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How long are you're daily commutes, to say work and back or to school?

Remember, if you're truck is not getting up to temp (180deg F or higher), then the truck will still be dumping fuel into the engine to get it to temp. Once the T-stat opens up and the temp sensors picks this up, the truck now will adjust the fuel to maximize its economy. So if you never drive more then 15min at a time, its no wonder I bet 3/4 of people here get crap mileage. You don't get 18mpg right off the bat.

For example, here is my mileage from a few weeks ago and look at the water temp(on the gauge, not cluster), my speed, RPM and calculated HP. Using this I can control my MPG by monitoring what the engine is doing and how heavy I am on the gas. This is just getting off the highway through town on a slight downhill, so it bumped it up maybe 2 mpg. Daily I get from 15-17 if its warmed up, if I do short burst or drive hard, I get crap 10-13 mpg. On a very good day where the conditions outside are good, easy 18-20.


Last edited by sylver91; 03-06-2013 at 10:48 AM.
Old 03-06-2013, 12:55 PM
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Even when I do longer trips my mileage is bad.



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