Check your air pressure!

[jambo101]

Teaches you to always recheck what you can after having your car serviced,on rare occasions they will actually forget to put the new oil in the car.,27psi isnt out of the ball park for operating parameters for your car,i usually run 28psi in winter to get a bit more traction.
Then theres always the possibility that the mechanic did in fact fill your tires to the correct pressure and your tire pressure gauge is misreading the correct psi. i once had a digital pressure gauge that was 10psi off. I've since bought my tire pressure gauges at the local speed shop and try to get the ones the racers use heres my current gauge
http://stefsperformance.com/bandb/pr...ge%2040540.jpg