25% of stove bolt post are wrong info.

[wsignman]

I heard that Ford & Chrysler went selling trucks because of V6 out worked their V8s

[bigblockv6]

I would have to say that held true for medium duty and heavy duty trucks not pickups. My father owned a grocery store in San Francisco and in the late 60 to early 70's I could remember the majority of medium duty trucks that made deliveries were GMC V6 trucks and there was one liquor distributor made deliveries in a HM-7500 series. Some of the bigger companies were Gallo wines, Nabisco and Morell all had GMC V6 powered trucks. Of course our delivery truck was a 62 GMC K1000 then the 68 KM2500.

[Hantke]

So is anybody here on jalopy? The general consensus seems to be that the 305 V6 in a truck will get 4-7mpg if you are lucky, is it me, or does that seem kind of low? I thought 12 was a more appropriate number


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[FetchMeAPepsi]

12 is closer. Most I've read seem to be around 10, with a general range of 9-12.

[Hantke]

Okay, cool, that's more doable than 4. I'm assuming it's that kind of info that gets these engines dropped in the scrap yard


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[FetchMeAPepsi]

I agreee. And I've heard of people change out the rear ends and transmissions and get 15-20 mpg out of them too. I guess if they're geared right they aren't much different than modern trucks in the gas department.

[Hantke]

Yeah some guy claimed 25 with a custom milled intake and a Holley racing carb on one of the hot rod forums. I suppose if you build the gears for a high torque low rpm motor I could see good mileage


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[bigblockv6]

10-12 mpg from my experience has always been the average on a 305 V6, my 68 KM-2500 would get that with 4.56 gears which I think is fairly reasonable from a 3/4 ton 4wd truck. Now if you're running a 1/2 ton with 3.07 gears it's possible to do better. Former member Rick Rusconi was getting 19 mpg in his 62 1/2 ton with the 305 V6 equipped with the Holley 500 cfm 2bbl carb running 3.07 gears and overdrive. After the 401M conversion he's getting 17 mpg.

[Hantke]

That's still pretty good! I would be good with 15 any day


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[6066gmcguy]

My 1965 2500 has 4.56:1 gearing and it got about 10mpg. the Rescue Squad I have not checked to see what the mileage is, 3500 with 305 1:1 top geare in trans, and 6.71 rear axle, I got 22.5" wheels on it as well, came stock with 20".