best mileage 7.3/6.0 - Ford Powerstroke Diesel Forum

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post #1 of 8 Old 04-22-2009, 06:20 PM Thread Starter
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best mileage 7.3/6.0

i'm lookin to buy a f550 with a automatic. which motor is giving up the best fuel mileage? what mods did you do to achieve this. i'm looking at intercooled so 99 and up please. post yours.
thanks alot, tim
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post #2 of 8 Old 04-22-2009, 06:22 PM
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Drive a 02 F450 7.3 with 4.30 gears and empty I get 12 empty going 75 MPH and get 10 towing going 75.
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post #3 of 8 Old 04-22-2009, 08:58 PM
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6 liter should have a bit better mileage.

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post #4 of 8 Old 04-22-2009, 09:58 PM
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I got 19 on my last 400 mile trip with cruise at 75 and 6 speed manual. 99 7.3 cc lb. Mods are Sniper 100 hp tune
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post #5 of 8 Old 04-22-2009, 10:11 PM
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what gears do you have venom nitrous

early 99
diy intake
4in downpipe 5in exhaust
dp tuner 60,80,120,140smoke
boost fooler
17 hpop
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post #6 of 8 Old 04-23-2009, 06:08 AM
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97 7.3auto getting 17.3 average tank

1997 7.3 extended cab 8ft.

4" straight piped
DIY intake- 6637 filter
178K on the dash
Boost, PYRO, Trans temp gauges (auto meter)
33" nittos on stock height
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post #7 of 8 Old 04-23-2009, 12:11 PM Thread Starter
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thanks for the replies. i'm thinking about getting a 7.3 intercooled(99/02) because i feel its a better motor but my main concern is mileage. did ford ever address the problems with the 6.0 on the newer models? i had a 03 and it lived at the dealer.
thanks, tim
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post #8 of 8 Old 04-23-2009, 02:35 PM
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i think the 05 and newer 6.0s had much better luck

early 99
diy intake
4in downpipe 5in exhaust
dp tuner 60,80,120,140smoke
boost fooler
17 hpop
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