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The faster you can drive, the better your data (when testing aero mods).
The route I use is a dead straight, nearly level 1.6 km (1 mi) stretch between the start/stop markers, with about half that distance on either end for speed up / slow down. I wish it were longer, though.
The posted limit is 80 kph (50 mph), but you can go 90 (55) without raising an eyebrow, and 100 (60) isn't uncommon (though it would attract police attention). There's also very little traffic on it other than start/end of the day plus holidays.
So to summarize, I'd say an ideal route for repeated (e.g. AAABBBAA) runs would be:
1) close to home (easy to use)
2) little traffic
3) flat
4) long enough between start/stop markers for your MPG instrumentation to settle into a steady average
5) a high posted speed limit (or no negative consequences for driving above it)
6) bonus: sheltered from the prevailing wind (if any)
Don't forget to drive far enough to warm up the entire car before testing. Coolant at operating temp <> warm drivetrain/tires.
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