Not even close guys.
Dump the car in the
Ferrytoll park and ride at the north side of the bridge. Parking is free up to seven days and its £11.50 rtn on the bus to the airport.
Guy I know uses it regularly and as he's got a bus pass (60+), he gets to the airport for free. He got a ticket once for overstaying by a day or two and paid up with a smile - it was still cheaper than Flying Scot etc.
There's another P&R a few miles before Ferrytoll, Halbeath which offers the same deal.
JF