460 MPG
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Freshman User
Joined: Mar 2016
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From: St.Charles
460 MPG
I filled my tank last week and reset my trip so I could find out my mpg. A week later im at half a tank with only 36 miles on the trip. Thats roughly 3.6 mpg. I know the exhaust manifold is leaking, could that be the cause or something else?
Posting Guru
Joined: Sep 2013
Posts: 1,033
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Fix the manifold clear the ECU of any prior codes and see if anything comes back. They get horrible gas mileage but normally not that bad N/A, You keeping the skinny petal to the floor? Or driving with an egg under the foot?
Post Fiend
Joined: Nov 2005
Posts: 7,437
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From: Charles Town, W bygod Va
You need to refill the tank and calculate the mpg with how much fuel was actually used, the gauges aren't very accurate. It's best to figure several fill ups and more accurate if you run the tank closer to empty. You may get more or less fuel in the tank depending on how the truck is parked while refueling.
Senior User
Joined: Feb 2008
Posts: 146
Likes: 5
From: Mocksville, NC
You are not getting an accurate check the way you did it. The fuel gauges in these trucks are notorious for not being linear, so 1/2 tank on the gauge is not necessarily 1/2 of the fuel. To check it properly, fill it up, reset the trip meter, run the whole tank of fuel through the truck, then fill it back up. When you fill it back up, look at the number of gallons on the pump. Use that number and the number from the trip meter to calculate your fuel mileage. If it is an EFI 460, you should be getting somewhere in the neighborhood of 8-10 mpg.
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