The 1947 - Present Chevrolet & GMC Truck Message Board Network

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The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=4)

- - 78 K20 Gas Milage Suggestions (https://67-72chevytrucks.com/vboard/showthread.php?t=729757)

geezer#99

02-12-2017 07:25 PM

Re: 78 K20 Gas Milage Suggestions

Quote:

Originally Posted by rich weyand (Post 7856847)

Note that at high altitude, the thinner mixture burns slower and you can go to higher advance. Most people can run an sbc at 16* BTDC at sea level, so you could probably go as high as 18* BTDC.

More is better -- more power, better gas mileage -- as long as you aren't pinging.

So true!
12 is not near enough.
If you want to fine tune your carb for a bit more mileage you can check and adjust the adjustable part throttle. Info here on that.
http://www.crankshaftcoalition.com/w...4MV_carburetor

patrickk1

02-27-2017 10:41 AM

Re: 78 K20 Gas Milage Suggestions

Quote:

Originally Posted by cadillac_al (Post 7855207)

I just read an article on the new Dodge Ram 3/4 ton truck and that gets 10 mpg too. That's all you can get out of big trucks.

This information is incorrect (I own one and track my mileage). I live in New England where it is very hilly and I average 13mpg. During the summer I've get up to 17 mpg in the same area. My mpg is better at 80 than it is at 70 since at 80, I rarely kick into a lower gear on a hill.

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