Better Gas Mileage?

[Lemonade]

Can a bug deflector (or maybe there's one for this specifically and I just haven't found it) help gas mileage on a class c motorhome? Would it keep the air flow from going up the windshield and smacking into the cabover? Has anyone had a good experience with Airtabs? Going from my prius to the micro Minnie is such a shock!
Great thread! No more 65.

[Elkman]

On a busy interstate I may need to drive at 65-70 mph to avoid problems but most of the time I can drive much slower if I chose to do so. If my next stop is a distance of 200 miles and I drive at 70 mph it will take me 2.86 hours and if I drive instead at 60 mph it will take me 3.3 hours or an additional 28 minutes. I have to decide whether arriving for example at 2:00 pm or 2:30 pm is going to make a real difference.

I found with my last diesel powered RV with its 6-speed transmission that the best fuel economy on the highway was at 62 mph and not at 55 mph as I would have thought. It comes down to the axle gearing and the transmission programming that affects shifting and changes in engine RPMs. At 72 mph the fuel consumption increased by 10% and with a 10 mph headwind the fuel economy dropped by 15-20 percent depending on the terrain.

Don't underestimate how much the driver affects fuel economy. Fleet operators know that with a truck pulling two trailer over a 1500 mile route that most will average 6-7 mpg but the better drives get 8-9 mpg with the same route and same truck and the same load. The "6" drivers costs the company a great deal more in fuel bills than the "8" or "9" drivers.