Mileage off on computer

[early99psd]

2 weeks ago I installed a DP tuner and reset the computer for mileage. I have only ran about 1/2 of tank of fuel so I don't have any real numbers on mileage. But the computer is showing 28.3 mpg. Has anyone had the same problem? With my superchips I had, the best I was getting was 17, and the computer still said 23. Is there a way to recalibrate it?


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[early99psd]

Am I the only one with this problem?


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[jesilvas]

It's called a lie o meter for a reason

[early99psd]

Why are they so far off? Is it because of the chip and bigger tires ( 305's)?


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[jesilvas]

It's cause they aren't usually right at first.
Some trucks are close, but a lot aren't. It's a combo or lift, tires, tuning, mods, and anything not stock.

[scottphillips88]

Yeah mines way off as well with a DP Tuner. The Edge Insight actually seems to be pretty dang correct however. I use the mileage coach feature and try hard to stay at 20-21mpg Only on tanks that I never blow smoke with What tunes do you have on your DP?

I have
1-Stock
2-+80hp Daily Driver
3-+60hp Tow Mode (I get way HOT with this! I tow on stock now!)
4-+120hp Race Mode

[early99psd]

I have no start, stock, 60e, 80e, decel, 40 tow, 80 tow, 120 race. The only thing I have towed was to quads with the 80 tow and loved where the why was and the way the trans was shifting. Why is yours getting hot? Do you have a boost leak?


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[Ray Bennett]

I have the edge insight, and sometimes it shows I get up to 24 mph, but when I do it via math, I only get 17 to 19 at best. Less than that if im getting on it. Now I know why people on this site post all kind of crazy mileage, i bet they are just going off their guages.

[early99psd]

Not going off the gauges for real numbers, just wondering why it's so far off?


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[Ray Bennett]

I think it just takes a mathmetical average over time, there fore if you coast alot you get a real high average, for instance I get better mileage acording to my insite when i drive over the mountains, clearly this is not true, But what happens is when you are drifting down hill the truck reads 100 mpg and that throws off the mathmatical average. When I drive on flat ground without a lot of coasting the computer reads pretty close.