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Old 03-03-2013, 09:33 AM
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H&s tuned getting 10mpg

What is going on? Rarely over 20 psi ,stock height, titan 51 gal tank. I've never seen a tuned truck with such low mileage. Any input wanted
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Old 03-03-2013, 10:00 AM
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H&s tuned getting 10mpg

Hand calculated? What truck is it (ie year, 250/350/450)? RC/SC/CC and SB/LB? Are you driving a lot of city? A lot of hwy? Traffic? Lots of hills? Loaded? Towing?

Need more info to tell help diagnose.


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Old 03-03-2013, 10:08 AM
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That's the computer. Sb Cc. City driving mostly unloaded
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Old 03-03-2013, 10:24 AM
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Hand Calculate and report back. What tune are you running? What shift schedule? Low boost fueling setting? Usually the dash reads higher than what you are getting, maybe in your case it is different. You need to check for brakes dragging, 4x4 and stuff.
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Old 03-03-2013, 10:25 AM
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H&s tuned getting 10mpg

City driving kills mileage in these trucks (takes a lot to get these things moving... They weigh 8000 lbs minimum). I have noticed that I get better mileage if I get up to speed faster, ie 30-35psi for 30 sec to get to speed rather than 15-20psi for a min and a half to get to speed.

Also what year is it? If its an 08 you probably have 3.73 rear gears. 09-10 has 3.55. Or if you have a 450 or a dually you probably have 4.10 (or taller). Rear end gearing makes a huge difference. The 3.55s will get the best mileage.

To be honest, 10-12 in the city is very normal for these trucks. They weigh a ton.


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Old 03-03-2013, 10:35 AM
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Mild tune. Lbf 3. Not sure about shift schedule but it goes through the gears pretty quick
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Old 03-03-2013, 11:31 AM
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Turn your LBF down to 0-1 and try S1M or S1L since you are doing a lot of city driving and see if maybe it goes up. Another thing. How much idling do you do?
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Old 03-03-2013, 02:55 PM
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Not much idling at all
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Old 03-03-2013, 04:38 PM
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H&s tuned getting 10mpg

What rear end do you have?! That'll help a lot in the suggestions from other org members...


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Old 03-03-2013, 05:16 PM
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What did You expect ?? The MPG can maybe be improved....but by another mile or so. You said city driving (which means not alot of miles per day)....so whats the diff ?
The problem: Its Not a Prius.
The solution: Dont look at the MPG. Keep one eye on the road....and the other on gas stations that sell diesel.When You stop to fill up and go to use the restroom dont expect to smell like Prada in there.
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