Lie-O-Meter is Way Off

[allevil]

I just went on a 1500 mile round trip with my Truck.

'08, Crew Cab, 4wd, with 35" Toyos, tuned with Spartan, 4" Flo-Pro, DPF and Cat Delete, and AFE intake.

Set the Cruise at 81mph as verified by my GPS, running the 275 tune. The LOM read 23.2mpg avg all day long and on the way home, read as high as 24.5mpg avg!

Here are the Actual Numbers from the last tank. 153.3 miles, 9.9 gallons = 15.48mpg.

The LOM Read 24.5mpg avg and read some Crazy Number like 575 miles to E.

Now, I'm not complaining about the Mileage, but the LOM is WRONG by 9mpg.

How does this happen? Can Spartan fix this to read a little closer with their tuning?

I really Love this Truck! The Power is Incredible!

With the Cruise set at 81mph, when you mash the Pedal. Bam! 100mph easy. Passing is a Breeze if you need to step into it.

I am very Happy with this Truck and Very Happy with Spartan!

[08stroker250]

I wish the LOM would move around more than it does. It might move .3 in a week on my truck. I would like to see it jump around more with how your driving at that moment. I doubt this can be fixed though

[BigKid]

Mine seems like it actually gets a little closer after I run the tune for a while. When I reload a tune, it typically is way off again telling me 22 and 24. But after a couple tanks of fuel, it is closer at 18 and 20.

Also to be noted. Mine has always been off. Before my programmer it would display 16 and 18, but when I filled it up and hand cal, it would be closer to 12 and 14.

[allevil]

I guess I forgot to mention that I reset EVERYTHING to 0 when I fill up.

I think that's what is making the biggest miscalculation.

I'm used to resetting all of the information at each fill in my other vehicles. Like something with no more than a Trip Odometer with an Dial Speedometer. No Computer Controlled stuff.

I'll bet if I left it alone for the ENTIRE trip, it would have read more accurate.

[wontonrunner]

Originally Posted by allevil

I guess I forgot to mention that I reset EVERYTHING to 0 when I fill up.

I think that's what is making the biggest miscalculation.

I'm used to resetting all of the information at each fill in my other vehicles. Like something with no more than a Trip Odometer with an Dial Speedometer. No Computer Controlled stuff.

I'll bet if I left it alone for the ENTIRE trip, it would have read more accurate.

My truck is the same way with my SCT.

My first tank it read 16.5mg and i actually got just under 14mpg. My first highway tank it read 19.2 and i actually got 16.5mpg and then i had a short trip in the city where it read 17.2 and i acually got 17mpg...my last trip it read 24mpg and i acually came out just under 19mpg...so far, I find it to be very random and inaccurate.

[po-po 5.0]

Are all of your trucks Job 1s perhaps? Mine was within 1mpg untuned, and within 2.5 running the 275. Granted, I ONLY reset it when the tune was loaded.

[wontonrunner]

Originally Posted by po-po 5.0

Are all of your trucks Job 1s perhaps? Mine was within 1mpg untuned, and within 2.5 running the 275. Granted, I ONLY reset it when the tune was loaded.

Mine is and I always reset it when I fuel up.

[drservo]

Mine is a job 1 HWY LOM 24.5, actual 18

[08stroker250]

I never reset mine, and its never as high as yalls. Mine is always accurate with highway at around 18 and higher than city by about 4 mpg (because I dont reset it)

[allevil]

Another thought here, at what speed is the best mileage?

Running 81mph, the RPM is 2100 and the Boost is about 8-9psi. I ran this for 450 miles one-way and my mileage was 15.5.

I wonder, if I slowed down to 75mph, the speed limit, or even 70mph, under the speed limit, if my mileage would improve much?

Please post your results.