but i can almost guarantee it's always cheaper to go the shorter route
The number of full stops is the killer. Not so much a penalty on the gasoline go-karts as compared to diesel trucks of any size, but it is still there. Wear & tear is cumulative over tens of thousands of miles. That is still the metric about saving money.
The heavy subsidization of fuel in this country makes chasing a few tiny tenths nearly meaningless. It's the cost of the vehicle over X-miles and Y-years that is the starting point. Extending the life of a vehicle over several more years is where true savings are found. Fuel cost is just one of a couple of variables under control of the driver. The rest is a fixed game.
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