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Old 10-03-2012, 12:56 AM   #1
80SPORT
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Re: Are there any regular cab dually picture threads?

an original paint 79 gmc w chevy grille ....

and an original paint 80...square lites

2 tone brown/beige was popular combo
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Old 10-03-2012, 11:20 PM   #2
1985-GMC
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Re: Are there any regular cab dually picture threads?

My old C30, A local guys K30, any some internet ones.
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Old 10-04-2012, 08:53 AM   #3
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Re: Are there any regular cab dually picture threads?

As usual I cant let a dually thread go by without posting.
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Old 10-04-2012, 11:16 AM   #4
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Re: Are there any regular cab dually picture threads?

Could we discuss mpg?
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Old 10-04-2012, 11:27 AM   #5
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Re: Are there any regular cab dually picture threads?

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Could we discuss mpg?
I would rather not

My 78
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Old 10-04-2012, 08:39 PM   #6
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Re: Are there any regular cab dually picture threads?

Haha yeah, lets just not talk about that...


The first one is an old scanned picture of my uncles truck, then some randoms.
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Old 10-05-2012, 12:17 AM   #7
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Re: Are there any regular cab dually picture threads?

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Could we discuss mpg?
yea could we?I may be getting one .I think.
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Old 10-05-2012, 01:33 AM   #8
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Re: Are there any regular cab dually picture threads?

i'm thinking of getting one also. That's why i want to talk mpg.
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Old 10-05-2012, 08:14 AM   #9
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Re: Are there any regular cab dually picture threads?

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yea could we?I may be getting one .I think.
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i'm thinking of getting one also. That's why i want to talk mpg.
Well then, in all seriousness, the way the truck is setup, the load you are hauling, the way you drive makes huge differences.

As mine sits, unloaded, a K30 with a SM465 (no overdrive) 4.11 gears, and 35" tall tires, 350 v8 and original carb I get roughly 12mpg, that is all wide open country driving probably 95% highway 5% city, and babying the throttle. Recently I made a 200mi round trip 70mph on the interstate with an empty trailer there, and then a 69 K5 Blazer and a bed full of parts on the trip home, I averaged 10.5 that day. A couple weeks ago I made another trip, about 100mi round trip to pick up a 71 C10, about 75% highway 25% city, I got right at 9mpg that trip.

I have had bad tanks too, 8mpg or so when I have used it around the farm a lot.

These numbers are all hand calculated, fill the tank to full, mark down the mileage on the odo. I do apply a 15% correction factor due to my taller 35" tires vs the tiny 30" tall stock tires that the odometer was calibrated to.

Also I noticed my mileage bump up about 1mpg when I went to the 35"s due to my highway driving and keeping the rpms down on the highway. If you did a lot of city driving, I'm sure you would have the exact opposite results.

I would guess a big block truck would be 2-3mpg less unloaded, and maybe just 1mpg or so less loaded.
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SOLD01 2500HD ECSB 6.0 4x4 5.13's 8" lift 38"s
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Old 05-02-2013, 09:13 AM   #10
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Re: Are there any regular cab dually picture threads?

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My old C30, A local guys K30, any some internet ones.
The 2 black and brown duallys are awesome
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