It would not surprise me if you could max your cruise distance simply by adjust your rate of climb so you were at bsfc peak, then coast back down at VBG
(feathered prop would be nice).
Wish I knew the specs (CDA, etc etc).
FYI wikipedia entry:
Rutan VariEze - Wikipedia, the free encyclopedia
puts it at 35mpg at 181 mph in "stock" form.