just another MPG question - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 6 (permalink) Old 12-14-2007, 03:53 AM Thread Starter
 
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just another MPG question

I am trying to improve my mpg as I'm about to start using it 100% of long distance travel. I'm currently getting 14mpg on its best day (no load). Towing is usually 7-9 mpg's pulling 7500#'s. Only 124,000 miles. 4.10 gears. When I bought it, it came with 235/85-16 tires (non OEM). 95% driven unloaded, 5% pulling a race car trailer. CC Dually
Given, I have been reading quite a bit lately, especially this entire section of this forum....so...on with the questions.
Will a tonneau cover help or hurt or no change?
Will going back to the stock size tires (215/85-16) help, hurt, or no change?
Will going to 3.55's or 3.73's help, hurt or no change?
I understand a 203* stat will help at a minimum but will be getting one b/c it will help.
Any other mechanical improvements?
I also need to check on the brake situation...as my brakes squeek upon braking once they get warmed up.

Thank you!
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post #2 of 6 (permalink) Old 12-14-2007, 04:56 AM
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Re: just another MPG question

I think 3.73's & trying to keep it below 2000 rpm will help.


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post #3 of 6 (permalink) Old 12-14-2007, 01:10 PM
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Re: just another MPG question

I bought my truck to pull a race car trailer too. I would think that you could go lower than 3.73 since its only 7500 # maybe the 3.55 if you are automatic. Bed cover will help as long as its flush with the bed. I'm working on doing a fastback myself.

I will try keeping the truck bellow 2,000 for the first time... (I like doing 80 mph so its hard to do 70 on long trips but getting used to it)

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post #4 of 6 (permalink) Old 12-14-2007, 06:35 PM
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Re: just another MPG question

I wouldn't want to pull 7500lbs with 3.55 & an auto. If it was a manual it wouldn't be so bad but with an auto it will be more doggy & harder on the tranny. Now 7500lbs & a set of 3.73 with an auto tows pretty good!


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post #5 of 6 (permalink) Old 09-02-2008, 05:32 AM
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Re: just another MPG question

Reducing drag and turbulance, a tonneau couldn't hurt your situation. I put an Undercover tonneau on mine and mileage went up 1.5 MPG average on the last 3 tanks of highway driving empty. It's really handy cause it locks, and still comes off so quickly when I need the bed. www.undercoverinfo.com is how I found it. Mine's one of those tool box buddies that they're trying to sell out of stock. They'll take almost any offer. I got mine for $250 shipped direct from their factory.

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'00 F-250 Reg Cab 6 spd. 4wd - bone stock
'68 Merc. Cougar 302 auto, Edelbrock 4bbl carb, mallory electronic ignition.
'78 F-100 Explorer, 400M block-C6 auto, 4wd (hopefully Cummins 4BT future home)
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post #6 of 6 (permalink) Old 09-03-2008, 01:55 AM
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Re: just another MPG question

From what I've found:
1. A flat tonneau was good for a 1.5 MPG improvement
2. I run 235s. 215s will make the engine rev up too much and hurt MPG
3. The numerically lower gear ratio you use the better your MPG will be. If you have a 4x4 maybe an overdrive might be the hot setup. A GV will give you 2.98:1 on demand. They are salty, though.
4. I use a 03 degree stat. It was worth0.5 MPG for me.

I have tested this stuff to death for eight years. Three things work:
1. Gearing
2. Aerodynamics
3. The nut behind the wheel

If you think you can make a better engine than hundreds of engineers with multi-million dollar development budgets, I'd recommend you give up your crack habit.

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