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Originally Posted by chefdave
on the toyota motorhome website they are known as 3slow going at the speed of parking.
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LOL
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for cruising 60mph seems to give best performace and fuel ecomony. when i brought it home 500miles from where i bought it noticed inclines were slowing it down unless doing 60mph.
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60mph seems very high for such barn door aerodynamics.
Have you tried mixing up with the trucks, around 50-55 mph ?
Uphill however, you could be falling behind the power curve of the engine when dropping below 60 / or dropping below the corresponding rpm in any other gear - so take a mental note what that rpm is.
Or travel away from motorways. You'll see a lot more.
Off motorway, you'll see benefit from reducing weight - on the motorway weight isn't as much of an issue.
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rounding out corners do i need to cut body work or can i cut a piece of drain pipe to fit over corner sharp edge.
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Cutting into the body work to round off the corners is probably way too involved, and may introduce leaks. The wind will relentlessly try to push rainwater in.
But anything you could do to round off the corners would help.
That's going to be difficult on the right (drivers) side though.
Rear roof spoiler would need a complex design to actually work.