I used to think that 10 miles was the limit of being acceptable for a "New Car." But I have learned that those first 10 miles are probably some of the most abusive your car will ever see. You've got people at the port driving your car, the lot attendant who drives your car, and the technician who preps your car. None of these people are very careful. But with today's engine building standards, I'm a bit less worried about a few miles. Also see the thread on these forums about the Mototune break-in. It does have some merit to it.
With my former '03 Mustang Cobra, SVT engineers purposely uploaded a tune to the engine that ran the car pig-rich so the engine wouldn't be damaged in transit. The technician at the dealership would then reflash the ECU with the regular tune. The problem was that many of the catalytic converters were failing because the guys at the lot in Dearborn all the way through to the transport guys would flog those cars and load-up the catalytic converter. Even though my car was delivered with 4.x miles on it, it was pretty well run-in even before I got my hands on it. On the other hand, my '03 Mustang Mach 1 had 125 miles on it when I bought it. No problems at all and, beyond changing the oil at 250 miles, never worried about break-in.
The question is whether the Elise will have already been run hard before you even get it. I had heard that the cars are test-run on a track in Hethel before being shipped. If that's true, I'd suspect that you'll probably have a few miles on the odo and a partial "Mototune" break-in already done.
Bob