You can import your fuel up records (CSV file) to Fuelly.com, and then we have GasTracker+ (Free) and GasCubby (Paid) for iOS that you can use to continue your vehicle tracking.
Currently our importer will only work for fuel up records. So services, reminders, trips, etc will not be able to be moved at this time.
However, we're actively working on an update to aCar that will allow you to sync all your data to Fuelly. I don't have an ETA to offer, but we hope to at least enter Beta-testing this year.
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