With tyre pressures set on the high side of the range that should give another 5-10% on any car.
NO NO NO.
It's at the cost of decreasing your tyres' life (because the tread in the middle will wear faster than the edges)
And at the cost of increasing your stopping distance, which might kill you or someone else. Or less dramatically, just raise your insurance premium considerably after a very minor bump that's your fault.
And since it's illegal to have over-inflated tyres, this might end up with you in jail or being banned from driving.
Biting the hand that feeds IT
