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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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