In Oregon, people rarely go more than 10 MPH over the low speed limit of 65 MPH. Big rigs don't go much over 60 (55 MPH limit).
Interestingly, one of the best tanks I've had was in Washington, I believe on I-90. The speed limit is 75 MPH, and the big rigs go 75 MPH. Ducking behind one of those, I was able to achieve fast travel and good fuel economy.
Places where the big trucks drive fast are great to get good fuel economy.
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