| There's a reason that, during the energy crisis of the '70s, the national speed limit was 55. Cars run most efficiently between fifty and fifty five MPH. Don't think that if you're doing 30 in a 45 zone, while everyone else is flipping you the bird, that you're saving the planet. I'm pretty sure that for every 10 MPH over fifty you lose 10% on your gas mileage. |