Most RV's have surprisingly decent drag coefficients, typically between 0.32 and 0.45. This is because they are relatively long compared to their frontal area, which reduces a lot of the "form" drag. RV's do have a large frontal area compared to a car which means they experience a lot more drag than something with a smaller frontal area and a similar drag coefficient. They also experience more "friction" drag since they usually have much more surface area.

Several companies keep looking at updates with lower drag coefficients and/or smaller frontal areas, but you have to have something that meets the safety regulations and appeals to buyers which does put some pretty interesting limits on the options.

- Eric