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What he said. I use MapMyRun to plan out longer runs (15-25 miles) and my garmin has never been more than a few hundred feet off - ergo, ipso facto, therefore, thus - MapMyRun will be pretty darn close for you if mapping a shorter route.While not perfect, MapMyRun is surprisingly accurate. It is a great tool for route planning, and my GPS (Garmin 405) agreed with it to within a few hundredths of a mile on a 5-mile run I did the other day.
That said, it sounds like you're training for time, so I'd recommend what the others have said - use a known-distance track for any kind of speed tests you might do.