AngelMay wrote: So if we drive the RV about 50 - 55 mph... we should get the best mileage possible (or pretty close, I guess).For the RV, that's probably right. In the real world, I suspect that the people who use the most gas on the freeway are the people who go as fast as they can in traffic. The reason is that after just a few minutes, they will surely encounter slower cars ahead and be forced to slow down. Then they will speed up again once they get around. I personally try to find a speed that I can set the cruise control that requires a minimal amount of intervention. In other words, at the speed of traffic. As long as the car has "tall" gears and is aerodynamic it should get good gas mileage even at higher speeds, such as 65-70. I also feel that driving at the speed of traffic is reasonably safe even if that speed is 3-5 miles over the limit. I wouldn't expect an RV to get good mileage at higher speeds due to aerodynamics, but I'm just guessing.CG
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