Small engines are not neccessarily more efficient at 1500 rpm. Sometimes that's too slow to make power.
I have a '98 F-150 with the small V-8, where the horsepower peak is at 4700 rpm. At 1500 rpm it was lugging. No guts. And with an overdrive manual transmission and 3.08 rear axle, it was putting along at 1500 rpm at 60. Wouldn't pull but half the truck weight as a trailer, rated at 2200 pounds trailer towing for a 4339 pound truck. Got 16 mpg.
I changed the rear axle gear ratio to 4.10, now I figure the trailer tow rating at 4700 pounds and I've had 6000 behind it. Gets 16 mpg unloaded at 60 mph. Gets 15 mpg at 52 with a 3000 pound camper on the hitch.
Now it has much better throttle response in all gears. It wouldn't have needed the axle gear change with the wide ratio transmissions of yesterday, but in a half ton in '98 the only manual transmission had only a 3.92:1 first gear. 6:1 would have been much better for towing.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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