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That's awesome! We've started getting trucks with single differentials here instead of the double differentials that have been common for the last 50 years or so (They're 6x2, most trucks are 6x4 drive). There are also collapsible trailer tails on the trailers and side skirts.
For what it's worth, the highest I ever managed to get a semi on MPG was 9.02 MPG with an empty flatbed headed from Chicago to Duluth.
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