The Most Important Time For Getting Good MPG - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 32 (permalink) Old 04-26-2008, 06:06 PM Thread Starter
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The Most Important Time For Getting Good MPG

…when you buy the truck. Either at the dealer or when you buy a used truck. We all sooner or later buy another truck. Here’s what to look for.

Some things improve MPG and some things kill MPG.

Like the Chinese restaurant, here’s a list. Pick and choose what you can handle.

4x4: Big killer of MPG and it forecloses some effective mods. Figure that half-ton of machinery costs you at least 2 MPG vs a 4x2 truck.

Automatic transmission: Another big MPG-killer. It is good for 2 MPG

Dually: It will cost you 1 MPG over a SRW

Crew Cab: It will cost you 0.75 MPG vs a regular cab

Club Cab: It will cost you 0.5 MPG vs a regular cab

Big tires: Anything over 235-85 or 265-75 will hurt. Figure 285s will cost you 1 MPG 305s will cost yet another 1 MPG

Lift: It will cost you 2 MPG

Gearing: Very strong effect on MPG
3.55s will get 1 MPG better than 3.73s (all else equal)
3.73s will get 1 MPG better than 4.10s
My 3.08s (not widely available) improved my economy by 3 MPG over the stock 3.73s
An overdrive (US Gear or Gear Vendor) will improve most trucks by 2-3 MPG
Be very careful about re-gearing if you have an automatic

The 6.0 and 6.4 are somewhat less efficient due to EGR and the filter thingy but I would expect a RC 4x2 six-speed SRW with stock tires and the stock 3.73 gears to get 19-20 MPG right off the floor if driven normally.

All the stuff above adds up.

A CC 4x4 automatic dually with 305s and a lift and 4.10 gears should expect about 9-10 MPG.

There is a certain variability to these things. YMMV.

To add insult to injury, the higher MPG truck will probably set you back $10-12,000 less up front. Even with my exotic drivetrain and aero mods, my truck may be one of the ten lowest-cost trucks in the PowerStroke Nation.

All these numbers square with my experience and what I have found out talking to literally hundreds of guys plus some design engineers.

Its your money. You know what you want/need. Get what you will but those numbers outline the unmodded MPG you can expect. The specification sheet if you are ordering a truck is a powerful tool.

2000 F-350 SC 4x2 6 speed
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post #2 of 32 (permalink) Old 04-27-2008, 02:03 AM
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Re: The Most Important Time For Getting Good MPG

Lets test your numbers...

My 99: 4x4 (-2), ZF6 (0), SRW (0), 305s (-2), 3.73 (+1); NET -3

My 02: 4x2 (0), 4r100 (-2), DRW (-1), 235s (0), 4.10 (0); NET -3

Those numbers look pretty good as my 99 got 16-17mpg and my 02 gets 15-16.

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post #3 of 32 (permalink) Old 04-27-2008, 05:55 AM
 
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Re: The Most Important Time For Getting Good MPG

Very good info Dave. makes alot of sense really. It is weird how guys can have pretty much the same setup as i do and claim 20+, and i am sure they arent grandpa drivers. I have driven my truck at 60mph for a full tank and never got more than 17 mpg. I do have 285s and 3.73s, and an automatic, ext cab 4x4. i know that doesnt help. But i try to watch myself. It is tough tho,
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post #4 of 32 (permalink) Old 04-28-2008, 04:47 PM
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Re: The Most Important Time For Getting Good MPG

Well I'm screwed. Lift, tall and wide tires, auto, 4 x 4, Supercab huge bumper. Doh!

I've noticed that the 20" wheels take a huge toll even compared to my old 16.5" rims even though both had 35" tires on them. Higher moment of inertia and all that.

Dave, do you figure on less mpg based on just weight for the CC/ SC options?

Thanks.

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post #5 of 32 (permalink) Old 04-30-2008, 11:14 PM
 
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Re: The Most Important Time For Getting Good MPG

FIRST POST BEEN LURKING AROUND FOR QUITE A WHILE, PS OWNER SINCE 2005
BEEN GETTING A CONSISTANT 24-27 MPG SINCE 17* HPOP WAS 22 SOLID
ALL ON 235 85 16 AND 3.55 REAR
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post #6 of 32 (permalink) Old 04-30-2008, 11:33 PM
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Re: The Most Important Time For Getting Good MPG

Dude, lay off the caps lock....... and if your truck honestly gets 24-27.... i will buy it for 50k.

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post #7 of 32 (permalink) Old 04-30-2008, 11:45 PM
 
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Cool Re: The Most Important Time For Getting Good MPG

sorry about caps lock, last tank was 700 miles one b4 that was 670 so with a 28 gallon tank putting in 25 gallons it is roughly 25 mpg mostly high way at about 60-65
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post #8 of 32 (permalink) Old 04-30-2008, 11:55 PM
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Re: The Most Important Time For Getting Good MPG

Well the smallest fuel cell available is 29 gallons...........

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post #9 of 32 (permalink) Old 04-30-2008, 11:57 PM
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Re: The Most Important Time For Getting Good MPG

As for me...

Stock mpg = 20
- 2 (4x4)
- 2 (Auto)
- .75 (Crew)
- 1 (285's)

= 14.25


Not too far off... add that I drive like I stole it often and that's why I'm right at 14 mpg.....

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2001 F250 Platinum - 11.62 @ 115.76 on Nitrous
2007 F250 - 10.916 @ 122.86 on Fuel
2005 F450 - Tow Bitch
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post #10 of 32 (permalink) Old 04-30-2008, 11:58 PM
 
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Re: The Most Important Time For Getting Good MPG

still do the math i was guessing 28 gallons the average fillup is 25 gallons
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