I owned a mid-'80s 3/4 ton 4x4 Chevrolet Suburban powered by a 6.2 liter diesel, that was spectacularly slow.
Part of the problem was that when new, on a good day, it had about 130 horsepower. After many years of wear and tear, probably less.
The other half of the problem was that due to the 35" steel radial mud tires on heavy steel wheels (including two identical full-sized spares carried inside), a 6" suspension lift, front and rear mount 9000-pound winch, spare rear driveshaft, spare fluids, full set of hand tools, air tank, high-lift jack, shovel, axe, 40 gallon fuel tank, skid plates, diesel engine, dual 1100 cca batteries, oversized radiator, and tree-killing bumpers fabricated from 2"x8" quarter-inch thick rectangular tube steel, it weighed well over 7,000 pounds.
I took it to the drag strip once. In spite of the centerline of the crankshaft being over the 24" maximum height from the ground, it somehow slipped through tech inspection. With 4.88 gears and lockers in both ends, it may have done well off road, but it was clearly out of it's element here. I took the maximum legal quarter-mile dial-in of 29.99 seconds, and sand-bagged through a few rounds of eliminations with ETs in the mid-20s at 40-something mph. I did not make it to the money rounds. They asked me not to bring it back, because they had a curfew of 2200 hours, and it simply took to long to wait for me to get to the other end and get off the track so that they could run the next pair.
But it did get 20 mpg. It would go 800 miles on one tank.
Part of the problem was that when new, on a good day, it had about 130 horsepower. After many years of wear and tear, probably less.
The other half of the problem was that due to the 35" steel radial mud tires on heavy steel wheels (including two identical full-sized spares carried inside), a 6" suspension lift, front and rear mount 9000-pound winch, spare rear driveshaft, spare fluids, full set of hand tools, air tank, high-lift jack, shovel, axe, 40 gallon fuel tank, skid plates, diesel engine, dual 1100 cca batteries, oversized radiator, and tree-killing bumpers fabricated from 2"x8" quarter-inch thick rectangular tube steel, it weighed well over 7,000 pounds.
I took it to the drag strip once. In spite of the centerline of the crankshaft being over the 24" maximum height from the ground, it somehow slipped through tech inspection. With 4.88 gears and lockers in both ends, it may have done well off road, but it was clearly out of it's element here. I took the maximum legal quarter-mile dial-in of 29.99 seconds, and sand-bagged through a few rounds of eliminations with ETs in the mid-20s at 40-something mph. I did not make it to the money rounds. They asked me not to bring it back, because they had a curfew of 2200 hours, and it simply took to long to wait for me to get to the other end and get off the track so that they could run the next pair.
But it did get 20 mpg. It would go 800 miles on one tank.