dealerships have started to charge a minimum of 1 hour, OR a diagnostic fee around here..
a friend i know took her car to the dealership with a flat tire it was the closest garage, called me in a panic, i was 2 minutes away so i went to pick her up anyhow. She said they were charging here $600 to replace the flat, the service writer charged her $250 to "diagnose" the tire was flat.. plus $25 in environmental, disposal,etc. I put the spare on in the service area, and took the wheel and tire to get patched for $10 down the street, while she finished her drive to work.