cummins 12v mpg vs 7.3 - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 17 (permalink) Old 05-12-2009, 01:01 AM Thread Starter
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cummins 12v mpg vs 7.3

Alright heres my question, does a 2500 club cab 4x4 12v 1998 12v cummins with auto trany get as good or better mpg than a 2001 4x4 7.3 auto super cab? both trucks fixed up comparably with about 400hp? and driven by the same person the same way?

Im in the position to help a buddy out with witch truck to get he does want the best mpg in a diesel truck

2000 f250 ECSB Dually 4.10s 305/70/16, 4x4 7.3 zf6 200k miles
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post #2 of 17 (permalink) Old 05-12-2009, 01:04 AM
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Re: cummins 12v mpg vs 7.3

The cummins will do better. I still get 19mpg with mine, and its in a brick truck lifted on 35's.

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post #3 of 17 (permalink) Old 05-12-2009, 01:17 AM
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Re: cummins 12v mpg vs 7.3

My 93 Cummins would consistantly get 19-20mpg no matter what,loaded,unloaded,highway,backroads.My 01 stroker can only touch that on highway w 35's,cruisin 65 it has gotten 23mpg.FWIW

2001 F350 SD K&N intake tube w amsoil filter nd prefilter,4in turbo back to 6in tip,TS chip,,isspro guages(poost,pyro,trans)AIH delete,CCV, Dr.evil trans w 3 disk lock up converter by Hughes,wicked wheel,Mag hytec covers with many more mods to come
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post #4 of 17 (permalink) Old 05-12-2009, 01:18 AM Thread Starter
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Re: cummins 12v mpg vs 7.3

thanks 19 is perty good, i get about 19 in my psd but mines is built for mpg with about 350 hp and stock suspention and small stock size hyway tires.

2000 f250 ECSB Dually 4.10s 305/70/16, 4x4 7.3 zf6 200k miles
Php hydra chip PHP tuned! 4" exhaust, stock turbo(ww2, turbomaster wastage actuator, gutted ebpv), FRX, 160/30 sticks SB 1939-CB single clutch, home brew water setup for when i'm pulling hay through the mountains.
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post #5 of 17 (permalink) Old 05-12-2009, 01:34 AM
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Re: cummins 12v mpg vs 7.3

In a straightforward, no BS test...probably about the same. Unloaded the Dodge, being built lighter should do a little better.

I have called for a MPG road trip with Dodges and Cheviies. Nobody ever takes me up. Wonder why not?

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post #6 of 17 (permalink) Old 05-12-2009, 02:56 AM
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Re: cummins 12v mpg vs 7.3

Cummins will get a little better mileage.

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post #7 of 17 (permalink) Old 05-12-2009, 05:13 AM
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Re: cummins 12v mpg vs 7.3

My 12v gets around 17, the same truck with a 7.3 got about 14. 7.3 was 500 hp, 12v is way more.

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post #8 of 17 (permalink) Old 05-13-2009, 03:10 PM
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Re: cummins 12v mpg vs 7.3

Dodge should get a little better, it has 3.55 gears and smaller tires factory anyway. Plus as Dave noted it is a lighter weight truck.

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post #9 of 17 (permalink) Old 06-16-2009, 12:32 AM
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Re: cummins 12v mpg vs 7.3

sorta makes sense about the mileage. 7.3 is only 1.4 liters bigger than a 5.9. of course the dodge will get better mileage granted it doesnt have massive problems and real low gears. talked to aguy that was getting 26 with 3.55 gears about thsi time last yaer. you can get around 22-24 mpg with a 7.3 running 80 consistently with 3.08 gears though.
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post #10 of 17 (permalink) Old 06-25-2009, 12:15 AM
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Re: cummins 12v mpg vs 7.3

In my experience a 12v will get 3-5 more mpg than a simular 7.3,towing
heavy even more.

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