That's because the tax payer is buying the fuel! The M1A1 tank holds just over 500 gallons of fuel and has a range of 300 miles. The big thing that makes it great from the tank is light weight. Tanks are heavy because of the armor. When they first started development of the M1 their target weight was 40-45 tons. Then the Brits came up with new armor and the target weight went out the window. Crew survivability became very important. Plus add in the desired ground speeds they wanted to achieve. About the only option at the time was the turbine. A tractor needs weight to get better traction. The next problem is heat. Exhaust gas temps on the turbine engine are such that if you park a modern car right behind a tank, goose the throttle up to about 2500 RPMS it will melt the plastic and bubble the paint on the front of the car. So the exhaust would have to go up, not down and the air flow requires a large exhaust. A tractor in the 40 or so HP range would have an exhaust the size of a dinner plate. The size in the tank would be about the size of a 200 gallon fuel tank on a truck.
The other problem with a turbine in a vehicle is there is no engine braking at all. Take your foot off the gas and you have to use the brakes to slow down even just a couple of miles an hour.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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