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  #1  
Old 03-18-2008, 12:21 PM
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Bad Fuel Mileage

My buddy Shane and I were talking about this and it's been an on going issue for quite some time now.

Shanes truck has less then 70,000 miles...
It has a rebuilt tranny (with red alto eagle clutches, better t/c etc...)
It has an exhaust, gauges and DP Tunes (80 econo is what he's been running).
He's got 285 bfg's with a small levelin kit on it.
It weighs mid 7's and is driven pretty gently around town.

The BEST he can muster is mid 12's in town... and 15's on the hwy. .

I DON'T DRIVE gently and I was averaging 14 mpg on the 120 setting and I drive mostly secondary roads and backroads - few hwy miles. I've gotten recently as good as 18 mpg on the way to texas with a car trailer in tow and mid 16's on the way back from texas with a trailer, car and another person in tow.

His truck is driving perfectly... what gives?

It's been like this for over a year and was just checked over by Scuffy... mechanically this thing is sound and if the way he keeps the truck clean is any indicator of his maintanence then it's immaculate.
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Old 03-18-2008, 12:30 PM
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I used to get 15's, now i'm in the 13's. I have no clue what happened to mine, but it started dropping about the same time fuel started going up. I thought is was my injectors, but after the stage 1's it stayed the same. I have replaced a few sensors, hoping to stumble on a culprit, but so far no luck. Back in '01 all of the 7.3's I was around got 15-17 mpg, regardless of mileage.
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Old 03-18-2008, 12:30 PM
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What's the stall in the T/C. Is it set too high?
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Old 03-18-2008, 12:32 PM
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I don't know

I usually have an answer for Shane but this one seriously has me stumped. Oh yeah... his truck has 80,000 miles.


His truck is running otherwise perfectly... he's thinking it's his tranny killing his mileage but I'm somewhat skeptical... who knows...
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Old 03-18-2008, 12:34 PM
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Quote:
Originally Posted by RedMule View Post
What's the stall in the T/C. Is it set too high?
I don't know what the stall is...

I let the tranny builders do their thing... that's something beyond me as far as internals are concerned... maybe one day I'll know more about them
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Old 03-18-2008, 12:40 PM
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It did make a difference on mine. Just a thought.
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Old 03-18-2008, 12:47 PM
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I just called and asked him.

He doesn't know.
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Old 03-18-2008, 12:51 PM
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I just called and asked him. He doesn't know lol...
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Old 03-18-2008, 01:41 PM
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winter fuel was my problem a few weeks ago past three weeks my mileage jumped to 18 from 10-12

the chemicals in winter diesel suck and burn faster foam more yada yada
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Old 03-18-2008, 06:21 PM
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Well, I am gonna replace the "el cheapo " converter I put in mine during the rebuild. I am 99.9 % sure I dont have tranny probs, just might be the TC tho. Was reading up on stall, and read that if the correct converter is in the tranny, then when you lift your foot off the brake, the truck should roll forward under its own power. Mine doesnt move. Also takes a wee bit more throttle to get moving than it did before the rebuild. Not a lot, but just enough to notice if you drive it all the time. Also could chirp the tires in first if I romped the throttle from a dead stop with the factory converter, but cant since the rebuild. I have no heat issues, and tranny feels perfect in all gears. Temps run 55-65 above ambient. I have thought all along that these little differences were a result of the transgo tugger hd kit we installed. Maybe/maybe not. I am gonna change the converter. I have to find out if Low Stall is best( I think I read it that way). Also have to find a good converter for 6-700. Cant go the 12-1300 route. Any of you tranny experts can chime in and lend me your professional opinions, and it would be greatly appreciated. Thanks in advance.
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