6.9, 7.3, 6.0, 6.4, 6.7? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 15 (permalink) Old 02-14-2012, 04:25 PM Thread Starter
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6.9, 7.3, 6.0, 6.4, 6.7?

what gets the best mileage?
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post #2 of 15 (permalink) Old 02-14-2012, 05:06 PM
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

Hard to say. A lot depends on the rest of the truck, what you do with it and how you drive.

6.4s and 6.7s don't have a manual transmission so their MPG is stunted.

6.9 and 7.3 IDI are a little less efficient but in a good light truck with a stick and driven well, could give good MPG. Pre-combustion engines can be deceptively efficient if you don't dog 'em too hard.

I'm a bit biased to the 7.3 with HEUI, six-speed, 4x2.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
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post #3 of 15 (permalink) Old 02-14-2012, 11:44 PM
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

bone stock the best fuel mileage that i have seen is from the 6.9 and 7.3 idi diesels
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post #4 of 15 (permalink) Old 02-15-2012, 12:27 AM
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

Had a 92 250 rc 4x4 7.3 idi 5-speed w/ a banks sidewinder turbo that got 16-18mpg. A 01 250 cclb 4x4 hypertech programmer, intake and exhaust that got 16-20. 03 6.0 Excursion 4x4 SCT programmer, intake and exhaust that got 15-22. And now a 02 cclb 4x4 SCT programmer and intake only w/ a 4.5" lift and 33" AT tires. Its get a disappointing 12-15. All numbers hand calculated.
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post #5 of 15 (permalink) Old 02-15-2012, 04:30 PM Thread Starter
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

I had a 87 f250 rcclb 6.9 4spd straight pipe and got 17 consistently. But just searching for a decent mileage vs. Power truck. No bigger then a sclb 4x4. Love a stick. Could live with 2wd...
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post #6 of 15 (permalink) Old 02-15-2012, 06:14 PM
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

got a 93 7.3 manual idi that gets 18-20 regularly and has reached 24 and i have a 99 2wd that i get 18 consistently and have almost hit 23
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post #7 of 15 (permalink) Old 02-15-2012, 08:12 PM
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

Quote:
Originally Posted by Dave Whitmer View Post
Hard to say. A lot depends on the rest of the truck, what you do with it and how you drive.

6.4s and 6.7s don't have a manual transmission so their MPG is stunted.

6.9 and 7.3 IDI are a little less efficient but in a good light truck with a stick and driven well, could give good MPG. Pre-combustion engines can be deceptively efficient if you don't dog 'em too hard.

Perfect logic.

There are many factors involved though.

Personal best in my truck was 19.7mpg
1985 F250 4x4 6.9/T19. It was N/A when I achieved that. With the turbo, I was averaging around 17-18mpg, down here in Texas its closer to 14-15mpg due to how fast I drive down here (55-60mph in Oregon, 65-70mph here)
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post #8 of 15 (permalink) Old 02-17-2012, 03:31 AM
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

I could get 18mpg hand calculated in my 02 6spd, CC 4x4 6" w/ Procomp XT's. Got a best of 21 when fully stock and could get 18-19 when fully stock. Had no measurable loss w/ the lift and tires.
I have to baby my 6.4 to get 18 at highway speeds but have squeezed 24mpg @ 55. Would like to regear to 3.31.

"New" 05 no payment, all original 305k and runs like a champ
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post #9 of 15 (permalink) Old 02-17-2012, 10:53 AM Thread Starter
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

I would say ex cab 2wd stick would be nice... Found so many 7.3s but not alot of 6.0 or 6.d. A 6.4 would b nice for how easyly it makes power.... It'd b nice to find something that gets over 20mpg.. My current ford escape does best of 26mpg at 50mph highway
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post #10 of 15 (permalink) Old 02-18-2012, 02:50 AM
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Re: 6.9, 7.3, 6.0, 6.4, 6.7?

Quote:
Originally Posted by Dave Whitmer View Post
Hard to say. A lot depends on the rest of the truck, what you do with it and how you drive.

6.4s and 6.7s don't have a manual transmission so their MPG is stunted.

6.9 and 7.3 IDI are a little less efficient but in a good light truck with a stick and driven well, could give good MPG. Pre-combustion engines can be deceptively efficient if you don't dog 'em too hard.

I'm a bit biased to the 7.3 with HEUI, six-speed, 4x2.
6.4s do have a manual tranny.

-Tyler-
-97 F-250 rclb, 305/70-16 cooper stt, 6637, PHP Hydra, AB's, e-fuel, sonnax, ebv delete, ccv mod, 3" dp to 6" tip--Sold
-08 Ram 3500 rclb, 6" Fabtech, 325/60-17 Nittos, egr/dpf delete, Efi by Draconian, s&b, 6" mitre
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