One gallon of gasoline carries 115,000btu of energy, that's a hard fact. A gasser engine puts give or take a few % of 1/3 of the gasoline's energy to the crankshaft. So that one gallon of gasoline is going to make 15HP over the span of an hour. Ideal steady state pie in the sky ideal fuel consumption at 50mph steady state for 20mpg would be 2.5 gallons per hr.Which would be using 37.5 flywheel HP average over that hour. I don't see how one can push a pickup and trailer through air drag at 50mph. Tire/rolling/drivetrain friction plus dragging 4.5 tons of truck/trailer/people/fuel uphill. While burning off that same energy with the brakes going down the other side of the hill. Lets add losses for starting stopping for traffic too etc.
Despite what some other on this site and elsewhere may think & say. You can't cheat the laws of physics. Automotive engineers do very well to wring the mileage out of vehicles. They must be frustrated when the "lah lah land " idealistic types without a clue in physics. When these lobby groups and equally clueless government officials want the impossible.
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Today's Featured Article - The Tractor Parade: Story of a Case SC - by Bernie DeLon. On a early fall morning back in 1994, I opened the newspaper and happened to spy an article about a local antique tractor club having their annual show that weekend.
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