Lie-O-meter not that bad?

[bbraden]

Well I've been hand calculating my mpg lately on my '07 and so far, I've learned that my overhead mpg isn't that bad. If I reset it exactly when I reset the odometer (before I pull away from the pumps) and don't touch it until I refill, it's been CONSISTENTLY .5 mpg high. Which is okay with me, I just subtract the .5 mpg. Six times in a row, it has been exactly .5 mpg high. Seems like a pretty good record to me. I think that the problems with the lie-o-meter come because people don't reset it at the same time they reset the odometer?

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'99 dodge 4x4 5 speed quite a few mods. north of 400 hp
'07 5.9 G56 4x4 qc 3.73's 1 ton SRW, BHAF and gutted intake, almost straight piped.. CM skirted flatbed

[hollingass]

the mods you have the more optimistic the meter becomes, ie: a edge EZ on high will instantly add 4 mpg on the meter

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06 2500 Patriot Blue & Chrome, Smarty,Edge easy, Silverline 4" Turboback, S&B CAI, Flex-lite 264, AFE Bladerunner, Fitch. 35" Coopers

[king nothing]

My truck is completely stock and my lieometer is constantly 4 mpg high

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06 Megacab Laramie
03 Mustang SVT Cobra Convertible

[dfcfu342]

It depends for me. In town its pretty darn close (+ or - .3), but on the highway it says I'm getting 25mpg at 75 mph. I sure wish I was, but its usually between 20 and 21.

Truck is stock other than K&N drop in.

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06 Mega SRW. Where did that silencer ring go?

[CalebZ400]

Mine is usually 3 or 4 high as well

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2006 3500 Megacab Laramie 4x4 G56 4.10s: Edge Juice w/ attitude-Hot, Quad X2 race, 5k 55w HIDs, F.U. switch, Rev wheels w/ 295/70/17 Nitto Terra Grapplers, Randy Ellis Designs light bar, Lightforce 240s Coming Soon: Southbend 3600DD

[twhetten]

mine is all over the place, its been up to 5 or 6 high to almost right on. I think the more miles you drive without resetting it the more accurate it is. A good friend of mines dad has on '01 and I know its hard to believe but he hasnt reset it in years, the truck has over 150k on it and reads about 15mpg all the time, it never moves anymore. And when hand calculating the milage it comes out to about 15.

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Ty-2003, Red, Dually, HO, 6 Speed(rip), Edge EZ, Airdog 150, Smarty,Jammer 90s, Full CAI, Capped Rail, water/meth, Valair 3600 DD, pacbrake, full rack-o-gauges, Dual Bull Hauler Stacks, Ranchhand Full Front Replacement, Hauler Bed 482hp/1078tq on 6/6/09 w/o jammers
1967 jeep kaiser M-715, P-pumped cummins, nv4500, np205, dana 60 front, corp 14 rear

[agoldxj]

mine is within .4 to .6 to hand calculated mileage. i don't ever touch it though and it stays consistant.

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06 flame red 2500 thunder road sport sbqc 48re, 4x4, 4.5" lift, 35" toyo mts on black xd hoss', bd steering box stabilizer, fox 2.0 dual stabilizers and shocks, afe stage 2 pro dry, fbd 5" tbe with 7" tip, edge juice w/attitude, debadged , door strips mia, custom night runner head lights, recon smoked cab lights, smoked fogs, custom wood grain delete...

[bbraden]

I think that resetting it in the middle of your hand calculation is the reason they get such a bad wrap for being off. I use mine exactly like I hand calculate. Fill up, reset the odometer, reset the avg mpg reading. Drive however many miles, fill up, divide the miles/gallons then reset the odometer and avg mpg and it has been exactly .5 high every time. If you reset it during the trip, it's going to be reading different miles than what your pump calculations will.

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'99 dodge 4x4 5 speed quite a few mods. north of 400 hp
'07 5.9 G56 4x4 qc 3.73's 1 ton SRW, BHAF and gutted intake, almost straight piped.. CM skirted flatbed

[agoldxj]

that makes perfect sense, im going to try it on my next fill up to see if i get any different results.

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06 flame red 2500 thunder road sport sbqc 48re, 4x4, 4.5" lift, 35" toyo mts on black xd hoss', bd steering box stabilizer, fox 2.0 dual stabilizers and shocks, afe stage 2 pro dry, fbd 5" tbe with 7" tip, edge juice w/attitude, debadged , door strips mia, custom night runner head lights, recon smoked cab lights, smoked fogs, custom wood grain delete...

[katana1150]

I too have found through hand calculating that my overhead display is fairly close to actual mileage

It bounces around a bit after a reset mine settles in at 17 to 18 mpg city/hiway combined

This truck beats the hell out of my Ford F-150, I can't get that dang thing over 14mpg even easy driving on the hiway. City driving with the ford gives me around 10 mpg, and we have to get emission tested every year and my ford passes with flying colors each time so it's tune is not the reason for such poor fuel mileage

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2004 Ram 3500 Quad Cab SLT DRW, 6 speed manual 4X4....91 F-150 RegCab 4X4 5speed 5Liter
Go ahead and cut me off with your pretty little Audi or BMW!! If we connect.........I WIN!!

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Last edited by katana1150 : 11-07-2009 at 07:50 PM. Reason: spelling

[EricN]

I reset mine as soon as the truck is running after refueling, I am consistantly off by 2litres/100km (guessing around 3-4 mpg) when I am driving like an old lady and trying to maximize my fuel economy. However, if I beat the piss out of the truck and drive like a madman, the fuel economy doesnt really change but the lie o meter is closer to being right.

[scrappy]

I use the same procedure @ refuel time of resetting everything.
I have been tracking it with every fill up for the last 8 or so tanks and the closest mine has been is 12% high with the worst being 28% high.
The average with all the fill ups I have been tracking is 21% high.

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361hp/677tq. 20090220 2007.5 2500 QC/SB, ETJ/DG7, Silver, SLT Thunderroad, 3.73's, 37.5 13.5r20 Pcomp extreme A/T's, KMC XD 766 "Diesel" wheels, 6" fabtech lift, AFE Stg.2 Megacannon, Bullydog Power Pup. '05 tail lights
Gone!457hp/1002tq. 2003.5, 3500SRW, qc/lb