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Old November 6th, 2013, 07:31 AM   #21
swampjeep
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I really can't imagine the 454 getting less than 7-8 mpg towing unless it was a 4.56 dually trying to run 70mph with a 12K gooseneck. A 460 will manage 8-10 across the midwest with just a car hauler.

No way a 6.5 is getting 14-16mpg towing
yes way...
buddy of mine was getting 18mpg towing a jeep to the UP with a 6.5 turbo diesel 'burb, he was not doing 75mph, and he was not towing 20,000 lbs, but he was towing a vehicle, on an 18' car trailer.
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Old November 6th, 2013, 07:50 AM   #22
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I got 16-18 with my 6.5 ext cab long box. but heres the thing. I liked my 350 vortec suburban better for towing. the gasser got about 9-10 but gas was cheaper and maintenance is ALOT cheaper. those PMD's on the 6.5 go out then you can relocate them for $500. I could replace my whole 350 long block for that much.

if your towing a smaller trailer and vehicle I would stay with the 6.5 it will get you better mileage.

but for a big block mud truck id find a used super duty with the 7.3 or just pay the extra in fuel for the 454.

how far are you really towing this bogger? most bogs are within an hour of peoples houses it seems now.
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Old November 6th, 2013, 08:23 AM   #23
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I will agree there may be other reasons to go with a gasser, or different vehicle, my argument was only about the cheaper fuel.

per gallon yes,
fuel cost per mile, I don't believe so
over all cost per mile, hard to say, but the 454 could win out,

when I went looking for a 454 to tow with a couple years ago, I was advised to skip it and go with something newer. I went with the 8.1, it has TONS of power, and about the same fuel economy we're talking with the 454. For my towing, I should have went with a 5.3. It would have towed a jeep on a trailer just fine, getting better economy while towing, and the other 350 days a year, it would have gotten WAY BETTER fuel economy.

BTW my 2001 GMC 8.1 crew cab 4x4 may be up for sale soon LOL
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Old November 6th, 2013, 05:17 PM   #24
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I'll be towing prolly average an hour one way, maybe more like hour and 45 mins, but also want to pull my jeep to silver lake and r&v , and of course the mounds

If I had money to buy a better truck I would, and I don't feel like having a payment right now, ill be getting the 454 on trade, and ill still have the 6.5 also, so I guess I can just test both to see what what is better for towing and fuel economy

The bad news is I believe the pmd is taking a crap on the diesel
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Old November 6th, 2013, 05:40 PM   #25
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I think I paid $450 for my pmd and relocation harness.
I mounted mine behind the front bumper.
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Old November 8th, 2013, 09:44 PM   #26
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Found a pmd and relocate kit on Craigslist for 100 bux, used with #9 resistor, pretty deccent deal..
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Old November 8th, 2013, 09:45 PM   #27
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Just picked up this truck, 97 Chevy 2500 454 121000 miles no rust at all and clean interior, already has air bags on the rear with in cab controls, runs and drives nice been well taken care of









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Old November 11th, 2013, 09:18 PM   #28
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I specialize in the 6.2 / 6.5. Can give you a couple tips to make your 6.5 come ALIVE !!! Really increases the driveability and performance without hurting it...
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Old November 12th, 2013, 07:15 AM   #29
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Quote:
Originally Posted by swampjeep View Post
I will agree there may be other reasons to go with a gasser, or different vehicle, my argument was only about the cheaper fuel.

per gallon yes,
fuel cost per mile, I don't believe so
over all cost per mile, hard to say, but the 454 could win out,

when I went looking for a 454 to tow with a couple years ago, I was advised to skip it and go with something newer. I went with the 8.1, it has TONS of power, and about the same fuel economy we're talking with the 454. For my towing, I should have went with a 5.3. It would have towed a jeep on a trailer just fine, getting better economy while towing, and the other 350 days a year, it would have gotten WAY BETTER fuel economy.

BTW my 2001 GMC 8.1 crew cab 4x4 may be up for sale soon LOL
No sir.

The 8.1 has twice the power of the 5.3, tows as well as the 7.3 diesel I owned. My 5.3's (I've had 3 now) have all been in the 8 mpg range with a jeep on a trailer behind the truck.

I can't comment on the 8.1's mileage, but I know years ago when I borrowed an 8.1 powered dump truck it was more powerful with my boat behind it (24') then my 5.3's have felt empty.
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Old November 12th, 2013, 08:15 AM   #30
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I get 10mpg pulling my jeep on an aluminum car hauler at 70mph with my dads Tahoe which has the 5.3
Empty in the city it gets 15-17mpgs

The 8.1 will be around 12-14mpg empty but when pulling it will be on line with the 5.3 and have way more power
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Old November 12th, 2013, 08:18 AM   #31
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my 06 sclb 1500 chevy get 15mpg city and i got 9.3mpg going to rocks and valleys for the mustache run. and with just my tj on the trailer it pulled just fine, but with a much heavier mud truck on a trailer i think ur on the right track going with the 454.
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