I want to try a few different tyre pressures. This is ok and doesn't present me with a problem. However the drive at my house is basically a field entrance and is not level! To measure my current pressures at cold I can put the car on the road (A little dangerous but possible) But to re-set the pressure I have to drive the car to a garage which is over 7 miles away, by which time the tyres are warm and don't then give a true reading. I don't really want to have to buy a tyre pump but is this the only option??