If your car handles in a heavy, sluggish manner, chances are your tyres are under-inflated.
Correct Tyre Pressure The average tyre should be inflated to between 20 and 30 psi or 140kPa.
Don't let your tyres sink lower than 15 psi or 105kPa, as the tyre may overheat, and deflate completely.
Tyres that are under inflated cost you money through increased wear and fuel costs.
Check your car's manual to find the recommended pressure for your car.