Terrible mpg
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Joined: Mar 2022
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Terrible mpg
Hey folks, first of all I'm no mechanic, but my gas mileage is terrible. My 2013 3.5 eco, with 38,000 original miles is running in the 10 mpg range. There is no check engine, or anything else that shows there is anything wrong. I have even had it checked for free wheeling issues. No one has found anything, and the truck runs fine. Like I said 38,000 original miles and running in the 10 mpg range, but mostly stop and go around town, and somewhat hilly conditions as I live in East Tennessee. Is this normal? Mas, cleaned, and new air filter last weekend. Any advice would help, especially since gas is close to 5$ gallon. Thanks.
Hotshot
Joined: Jul 2005
Posts: 11,931
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You have a instantanious gas mileage digital gauge on the dash... You should be able to see 16-18 MPG when cruzeing on level ground at 60 mph... Then you can see it go to 6 mpg when you accelerate, and 6 mpg when climbing a hill........... If you spend a LOT of time stomping on the pedal and climbing hills, you could easily be at 10 mpg....... and winter driving will also drop you 1-2 MPG.
Have you had it since new ? Is this DIFFERENT than last year ?
Have you had it since new ? Is this DIFFERENT than last year ?
Thread Starter
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New User
Joined: Mar 2022
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You have a instantanious gas mileage digital gauge on the dash... You should be able to see 16-18 MPG when cruzeing on level ground at 60 mph... Then you can see it go to 6 mpg when you accelerate, and 6 mpg when climbing a hill........... If you spend a LOT of time stomping on the pedal and climbing hills, you could easily be at 10 mpg....... and winter driving will also drop you 1-2 MPG.
Have you had it since new ? Is this DIFFERENT than last year ?
Have you had it since new ? Is this DIFFERENT than last year ?
Thread Starter
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New User
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Tuned
Joined: Aug 2021
Posts: 274
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I have the 3.7. With all the stop lights here, I get between 10 and 12mpg. If I toss in some freeway driving, I might get 14. I still need to see what it does for like 100mi of freeway and no city streets.
Tom
Tom
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More Turbo
Joined: Jun 2014
Posts: 716
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From: Asheboro, NC
^this. I live in a hilly area and often "downshift" to 5th or 4th by turning off gears 6 & 5. I've found that since we got the 2 flash updates for the leadframe the transmission wants to lug the engine. Often I find myself in 6th on a slight incline at 40 mph. That's too slow. My combined all-round driving averages 16-18 mpg.
Fleet Mechanic
Joined: Nov 2003
Posts: 1,311
Likes: 7
Should be better than 10mpg. I own a 5.0L Supercab FX4 of this generation, in stop and go traffic, depending on my luck with lights and what have you my mileage usually ranges between 14mpg and 16mpg ''16 mpg is being very thoughtful about mileage and coasting as much as possible''. Highway mileage is around 20ish mpg at 70mph but it starts to drop sharply if I go any faster than that, at 80mph my mileage averages between 16 and 18 depending on if there's a headwind or not. Should also be noted I have BFG KO2's ''factory size'' as well on my truck. At 10mpg average I would think its either something wrong that hasn't been diagnosed yet, or you have an aggressive driving style that eats fuel.
Lead Driver
Joined: Nov 2020
Posts: 7,128
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From: Sportsman's Paradise
Should be better than 10mpg. I own a 5.0L Supercab FX4 of this generation, in stop and go traffic, depending on my luck with lights and what have you my mileage usually ranges between 14mpg and 16mpg ''16 mpg is being very thoughtful about mileage and coasting as much as possible''. Highway mileage is around 20ish mpg at 70mph but it starts to drop sharply if I go any faster than that, at 80mph my mileage averages between 16 and 18 depending on if there's a headwind or not. Should also be noted I have BFG KO2's ''factory size'' as well on my truck. At 10mpg average I would think its either something wrong that hasn't been diagnosed yet, or you have an aggressive driving style that eats fuel.
