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Not that I'm aware of, and as @Nick.Earthloop says, the variation in gradients makes it near impossible to come up with a sensible rule of thumb.
I'd say, at a very rough level, a flatter route is worth 2-3 mph more in something like this, so the detour in 24 hours would have to be less than 70 miles to make it effective.
andyp
There is a rule of thumb for walking that x amount of ascending in a route is equivalent to adding y additional miles to the route (can't remember the numbers). Is there an equivalent for cycling?