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post #1 of 11 Old 03-31-2012, 02:33 PM Thread Starter
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mpgs

I drove 160 miles this week 120 of them being highway. filled up today 15 gallons saying im getting 10.6 to the gallon. Running 35s 6 in lift. i would think i should be getting mid teens at least. could underinflated tires cause this or maybe im missing something. no mod as of now
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post #2 of 11 Old 03-31-2012, 02:40 PM
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You're going off the trucks meter? If so, it's wrong. If you're hand calculating (which is the only way to tell for sure), then the speedo has to be corrected to the bigger tires.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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post #3 of 11 Old 03-31-2012, 03:46 PM Thread Starter
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How do i correct for the speedo a tunner? i drove a 160 miles and put 15 gallons in that's all i know lol
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post #4 of 11 Old 03-31-2012, 03:47 PM
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Not sure how. AutoEnginuity can change it, I know that.
You can get a GPS cause it will show how far you travel between fill ups.



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post #5 of 11 Old 03-31-2012, 04:17 PM
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its really not too hard hand calculate for the bigger tires, my stock size is 265/75/16 and with 35s its roughly a tenth faster and farther, example; 160x1.1=176 miles. and @70mph you are really going 77mph

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post #6 of 11 Old 03-31-2012, 04:44 PM Thread Starter
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so im not real sure but your saying i am going more miles then my speedo is saying hmmmm
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post #7 of 11 Old 04-01-2012, 12:43 AM
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I have a 5.5 inch lift and 35s. After reading the correct mileage driven (GPS) I was averaging 10.6mpg exactly (only city driving). I ordered a custom tuned TS chip tuned by TW and no joke. I saw a 2mpg increase. Granted I am a pretty sensible driver. But after I installed the chip I saw 12.4 mpg every tank on my DD tune.

But like Jesilvas said, you are actually traveling further then your speedo says. When I'm doing 50 on my speedo, it comes out to 54. When I'm doing 60 I'm actually doing 65. The way I see it, for every ten miles per hour, I'm doing 1mph less. So if its in the 50s, I'm doing 4mph faster then registered, in the 60s I'm doing 5mph faster, and in the 70s I'm doing 6mph faster.

Sorry if I'm not making perfect sense, but I hope you get the idea. Before my chip, running my 5.5 inch lift and 35 a/t's was getting 10.6mpg. Once I got my chip and i drove reasonably and sensibly, I am now getting 12.4-13.1mpg per tank (DD and Street Tune). Hopefully this helps. If not, I'm sorry lol. But when i was running no chip and the current set up I have, I was averaging 10.6mpg per tank (city driving only), so for the lift and tires you're running, that sounds about normal

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post #8 of 11 Old 04-01-2012, 02:35 AM Thread Starter
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Ok but the only thing is im doing mostly highway driving about 70 most of the time
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post #9 of 11 Old 04-01-2012, 09:35 AM
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There's a guy on here, which I'm sure he'll pop in sometime and comment on this, but he has 35s and i believe a 4in lift kit, and he swears that he's never seen anything over 14mpg on the highway. (if my memory serves me correct). It just depends on a lot of things and driving habits. But the bigger the lift and tires, the bigger the drop in mpg you'll see. You should check for leaks though. That could be a potential cause to your low mpg

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Fully loaded with all the goodies

Dreaming of: Injectors, Twin turbos, Dual cp3s, and all new custom tunes

Planning for: 2011+ front end conversion and American Force rims
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post #10 of 11 Old 04-02-2012, 04:47 PM
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I have played with my 40hp & 80hp tune in town driving and I get about 12.7 hand calculated every time (3 tanks so far). And this is with 37" tires, this weekend towing my 18ft trailer with the CanAm Outlander on it and minimal camping gear on the interstate driving 80mph I still got 150 miles to a half tank.
And this seems to be the best I can get per half tank right now. And that is with adding 1oz of AMSOIL HP Injector 2 stroke per gallon and AMSOIL cetane booster.

My TS chip is a stock chip, so Im going to send it off to either Jody or PHP for some custom tunes.


2000 F250 CCSB, 6" Lift, 20" Fuel Hostage rims on 37" Toyo MTs, BTS Tunes & BTS Valvebody, straight piped, Tru-Cool 40K cooler, scangaugeII, Autometer triples go in this week.
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