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(500mi / 6.5mpg) * $5.313 = $408.69

6.5mpg - I just Googled average MPG for a fully loaded Semi, could be wrong.

$5.313 - Most recent highway diesel price (https://www.eia.gov/petroleum/gasdiesel/). I'd expect this is high due to fleet discounts and such.

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I feel like that average is really low. Talking with my buddy who is a trucker, he said that 6mpg is on the low end. His truck, which isn't anything special, would usually get 8-9. He said those guys getting 6 or lower are usually owner / operators who have older trucks, either because they like the older trucks or they can't afford to get a new one. Most fleets have much newer trucks, a lot of which can get up to 10mpg or more. That may not seem like a huge improvement, but over thousands of miles it adds up really fast.

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