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Discussion Starter #1
Hey everyone, Looking for something else to help with gas mileage on my 95 f350 4x4 crew cab and performance. Right now I have a ts 6 position chip with tunes from tyrant deisel,around 85hp with the stock injectors is the most he said it would take.A S&B intake,oil is t6 shell with rev-x in it,also put the rev-x in the differancails last week. Like I said its a 95 7.3 4x4 crew cab with a 10" lift and 395/70-16(38x15.5-16) oh and a 3" down pipe and straight thru 4" exhaust.4:10 limited slip gears. Its got 206000 miles on the truck.I drive highway now about 30 miles each way and I figure out each tank I get an average of 12 to 14 mpg. So was wondering if there was anything else I can mess with to get both mileage and performance out of my truck. Thanks for any info
 

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Not what you want to hear but those 38s with 4.10 gears aren't doing you any favors in the performance or mileage department.
 

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Discussion Starter #3
Yeah I know they don't help to much. I've thought about lowering it back to stock wheels with 33"s or 35"s but that takes some cutting of the front leaf spring mounts that are welded on the frame really good. I'm a welder and they did a good job welding it on. I like that set up like urs looks really good
 

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Discussion Starter #4
Oh yeah and I use opti-lube for a fuel additive also.
 

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Stage one injectors with supporting mods and GOOD tunes.... such as e-fuel, moded HPOP,intercooler, moded IDM, and freshen up the turbo with a good rebuild. Could even think about regearing a little lower to gain factory gearing back

Also look at the simple things such as clean the exhaust back pressue tube, keep filters clean and stay under 65mph! Another thing to look at is the % of torque converter slip and when the TC locks up.
 

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Do you figure in the larger tires into your mpg calculations?

On my truck w/ 35's, I get 16ish mpg uncorrected around town. When I add in the correction factor for the 35's, I'm around 18+mpg in the city.
 

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I got 16 with 35s,3.55 gears,6637, edge evo, and had crappy downpipe. Take lid off the intake and go down tire size
 

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Discussion Starter #9
No I didn't figure that in that slipped my mind so maybe not doing to bad on mpg. And all filters stay clean but I'll hav to ck that exhaust tube
 

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Discussion Starter #10
I should b filling up on fuel today how do I figure in the tire size to get the right mpg? And on the tc lock up does the tunes on the chip control that or do I need to get one of thoses tranny modules?
 

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Good tunes will control your TC lockup for you. I'm not really sure how far off 38's are.. my 35's are 10% off... prolly 1-3% more for 38's but I really DONT know. Easiest thing is to reprogram your speedo.
 

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Discussion Starter #12
Just remembered I hav gps on my phone so I just filled up and going to run the gps on this tank to get real mph and real mileage.last tank went 311.1 on the od and put 27.88 gallons of fuel in. So far speedo at 50mph is actually 58mph
 

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Yep... sounds about right. I usually get 325miles for just my front tank... roughly 18.x mpg. So I would take your 311miles traveled and multiply it by .11; probably closer to 345 miles. But I'm really not sure if .11 is accurate; it might be
more because you are going a good 3mph over what mine was registering. You can adjust the speedo yourself (its a *****) or pay a Ford shop .5-1 hours of work.
 

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Discussion Starter #14
Yeah so looks like my gas mileage isnt to bad after all. But going to run this gps thru this tank and see. I measured my tires cuz they r pretty worn and they r about 36 1/2" tall and new they r 37 3/4". So now just need to work on some more hop up mods to give it a little more kick
 

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Ya if you modded that truck a bit to give it more power to overcome those 38's you'll def get better mpg. A good custom chip, intake, turboback, and maybe swamps idm would be great... then a valve body.
 

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Discussion Starter #16
Yeah I know the ts chip I have from tyrant deisel he said he put the most he could with stock injectors which was 85hp on daily driver mode and 85hp on race mode just different shift points and seems like the daily mode it kicks in about 1800 rpm and race mode about 1300 rpm and longer shift points in race mode but not sure about when the torque converter locks up can really tell. Got the 3" down pipe and 4" exhaust straight thru,and S&B intake on there now.
 

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With good tunes, you can tell in feel and sound when the tc locks up. the truck sounds more like a 5spd in that it's a 1:1 ratio between the motor and the wheels turning. It sounds deeper, and runs more crisp when the tc is locked.
 

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Discussion Starter #18
Ok I'm going to look up the 2 places on here that people talk about for there chips and talk to those guys about reburning mine and make sure they know my whole set up. And what do you think of an electric fan on these trucks for a daily driver I know that will free up some power and stress but don't want to worry about it getting hot I do live in Florida where it's 90 at Christmas time lol and thanks for all the info this is my first ford and first diesel so its all new to me but I've always been into cars trucks,and been building old triumphs.
 

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I've heard that e-fans can get you 40-ish hp on these trucks.... and selecting the right e-fan will keep your truck cool. I think it was bigfuel that was talking about this subject a few weeks ago.
 

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Hmm I thought I remembered reading through the various efan writeups that electric is not the way to go if towing as its difficult to find a fan with enough flow to keep the motor cool on long grades with a load? I could be wrong, and finding a fan isnt so hard but I recall reading otherwise.
 
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