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USN Retired
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Discussion Starter #1
Updated Hypertech fuel mileage test.

Tuner used was a Hypertech Max Energy Econ Power Programmer - Part #43005.

Course was a 6 mile run at 65MPH on cruise control, highway only trip, mostly flat with one moderate incline/decline. Temperature was 40 degrees F, road surface was wet (Washington State...go figure).

Stock: 19.6 MPG
Stage 1: 21.5 MPG - 9.6% increase in fuel economy (+44 HP +72 FPT)
Stage 2: 21.9 MPG - 11.7% increase in fuel economy (+80 HP +131 FPT)

I did not run Stage 3 this time as it is only for drag racing and of no use to me. The prior test showed a significant drop in fuel economy.
 

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Let it all Ride
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1,316 Posts
So ugh, how did you hand calculate a 6 mile trip? If you're basing these mileage gains off of the liometer, these "tests" you've done are a complete waste of time. Also, were these "tests" done the the DPF in place? If so, there isn't a snowballs chance in hell you could achieve 21 mpg's.
 

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USN Retired
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Discussion Starter #3
Yes, I did use the "liometer", and the Scientific Method (i.e. as long as the same standard of measurement is used throughout an experiment, statistical measurements can be used in the evaluation of an observation to show relativity).

As for the "liometer", I have found that the onboard computer over-estimates fuel economy by a factor of 15%. Case and point, I regularly drive from Seattle to either Sacramento or Los Angeles. The trip varies between 1,400 and 2,000 miles (hence the 210,000 miles on my 08). Actual calculations at the pump regularly return between 19.5 and 20.5 MPG. The "liometer" typically reports it at around 23. For reference, my around town reading is about 16.5 so I figure I'm getting abut 14 - 14.5 MPG.

As for the DPF, as much as I would like to do a DPF delete to get rid of those nasty around town Regens, my job as an Agent and employee of the Federal Government prevents me from doing so.
 

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Let it all Ride
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I can't imagine why in the world you would EVER want to do a DPF delete kit getting 20 mpg's on a stock configured truck. You my friend have whats known as the best MPG 6.4 on the planet. My fully deleted 6.4 won't get over 18 mpg ALL highway.
 

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Let it all Ride
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1,316 Posts
Based on your reported MPG's, I'd be getting nearly 800 miles per a tank of fuel. Maybe the Hypercraps aren't as bad as they use to be.
 

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Junior Member
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50 Posts
I am with the others, your test is flawed, each tune is different and the lie o meter does not read them the same. i have found that the higher the tunes the more the lie o meter is off, and a 6 mile run ?? You said same standard of measurement, there was no same measurement, the lie o meter with different tunes is not standard, sounds like goverment thinking to me, and yes, like Eazydeezy, why would you mess with the highest stock 6.4 mpg on the planet. i have run the same trip you do, stock and tuned ,at 70 mph, stock going over siskiyou's you are averaging 6 mpg more than anybody else....
 

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Senior Member
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606 Posts
If he is running mostly highway miles and it looks that way a stocker could get 19 mpg. Running the cruse control, keeping the speeds down below 70, running 1850 to 1900 RPM. Once you get these 8,000lb + trucks rolling the engine is not working that hard. To the OP. The lieo meter will change with the tunes. So not evey thing remands the same through out the test.
 

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I was trying to think your way but drove almost the same route when stock, went to anahime and also to reno. i live in washington also so same driving. Too many hills and mountains and too much traffic in the citys he went to. yes on a flat highway doing 60 mph he and I could get 19.6 mpg but not for the entire trip as he is implying, i can go down a hill, push the button and make mine say 99.9 mpg but for the tank i did not get that.Not trying to be a bad guy on this just don't understand the people that go to Las Vegas and tell you that they took $1000.00 out of a slot machine, they forget to tell you that they put in $1500.00 to do it.
 

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Senior Member
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606 Posts
I have driven that route many times. When you are south of redding, then setting the cruse control for 1900 RPM, 19.0MPG is was easy for me when mine was stock. I also have a manual and a lighter truck.
 

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Junior Member
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50 Posts
As i posted I never said that 19 mpg was not impossible , MCaje was implying that his round trip average, stock was 19.5 to 20.5 mpg. These trucks stock don't do so good at 70 mph, thats the speed limit on a lot of the freeway, throw in a couple mountain passes and some in town driving and the round trip average, just my guess from driving it before, yes i have a 4 door long bed and it's on the heavy side, that he is getting 15 to 16mpg average. i would like to be proven wrong, I would like to believe that my truck was just a bad one and MCaje has a good one but there are to many people on these forums that get milage like I do. spartan tuned I have hand calculated 24.7 mpg, short trip on flat freeway but thats not real, thats what I can max out at but not average.
 
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