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Re: 78 K20 towing with 454
We had a 1977 C-10 Suburban with a small block and SM465. No idea the exact axle ratio, but it was fairly low. Still we towed a camper and a big u-haul trailer up to 65mph on the interstate. As I recall it got about 13 mpg towing and about 18 mpg solo, which seems pretty reasonable.
Now I'm almost sorry we traded it off because it always ran so good and pulled so strong. But it was a rugged brute: manual steering, no headliner or insulation, and the rust that had been painted over before we got it was coming through pretty bad. The 2wd did fine on snow and ice but not so well on muddy Montana back roads.
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Current/past Chevy/GMC trucks:
1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD
Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner
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