[Lotus7]

As the manual says, the 32F/35R recommended pressures are for a light to medium load (up to 3 passengers).

If you prefer slightly "crisper" handling, less understeer at light throttle, and a better safety margin for heaver loads you might try 35F and 37R. Higher pressure will give you slightly faster "turn-in" response, and lower pressures will soften the vehicle's transient response because of sidewall deflection, and of course, will give a slightly softer ride. However, with run flats, the sidewall vertical compliance is so bad already, running the tires very low doesn’t improve the ride significantly.

When you measure pressures, the car should be at outdoor temperature (in the shade) and the tires, wheels and brakes should be cool to your touch. If they feel even slightly warm, you should wait before measuring the pressure. Every 10 deg. F temp. increase will cause the pressure to read approximately 1 psi higher). Use a good (never dropped) dial gauge or more likely a digital gauge. Most of the digital gauges can resolve a difference of 0.5 psi and even the cheap ones ($10) are usually accurate to about +/- 1 psi.

A good race-quality gauge with 0.1 psi resolution and 0.2 psi accuracy will cost at least $60, but is totally overkill for regular street use.

Always remember to reset your TPM (procedure is simple and is in the manual) whenever you adjust any tire pressures.