Quote:
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Would you please define the road, cart, and any topological or environmental considerations?
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The road is a level flat surface, the cart is a small rigid body that has it's weight supported by four wheels mounted on two axles. There is small but positive rolling resistance, and small but positive air resistance. There are no magnetic nor electrostatic attractions nor repulsions. There is no magic nor telekinesis going on.
Our inertial frame of reference is the road, and there is no wind.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)