That would be more plausible if many other android apps got the same bump in sales on that day. Unfortunately we don't have this information yet. Personally, I suspect that it had more to do with the app advancing to the final round of the ADC2 contest, which happened on the same day.
"I'm attributing the recent uptick in sales to 2 factors: (1) The release of the Droid phone and (2) Car Locator being in the final judging round of the ADC2 contest."
"I'm attributing the recent uptick in sales to 2 factors: (1) The release of the Droid phone and (2) Car Locator being in the final judging round of the ADC2 contest."