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Hypermilers are a small fraction of the motoring population. The Department of Transportation should design roads and signage around people who don't even know that driving style affects fuel economy. They should place signs that cause people to DWL whether they know it or not. Speed reductions should coincide with up-grades, rest stops and weigh stations belong at the top of hills, toll booths don't belong at all, etc.
I've occasionally seen the DOT think about the fuel economy impact of their actions, but they're far from consistent. Maybe they need fuel economy activists to make themselves heard? I suppose we could each write a letter to our DOT encouraging DWL-friendly and bicycle-friendly roads and signs.
One unfortunate fact is that villages, where speed limits are slower, tend to sprout up in valleys, where there is water. That's the opposite of what you want for DWL.
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