Ah, thank you, basically what I thought. I keep tools and stuff in the car so like all the tyres to be at 33psi, which is where I put them today. Looks like I'm best dropping them to 31, before I even start the car tomorrow.
The 2 psi increase in warmed tyres was only an estimate by me to illustrate the point. I think its in the right ball park but the increase could be more ,or less, depending on distance driven, driving through bends, your speed, air temperature changes during the day etc. You shouldnt use it as a reason to deduct 2 psi.
If you have arrived at your own preferred pressure of 33psi all round through actual experience of better ride or other advantages then fair enough (although the recommendation normally has a higher pressure front than rear.) But when testing performance did you always measure it as 33 psi with the tyres already warmed - eg after driving to a garage air line? If not you shouldnt be reducing to 31 psi 'when cold.
If you have chosen 33 psi just because its more in keeping with pressures that were recommended in the past then maybe re think your motives.
As others have said there is a lot of inconsistency in accuracy between garage air lines, portable inflators , and separate pressure gauges. Including those supplied by Honda or even between different examples of the same make of pump/gauge. A reading that is inaccurate by a couple of psi either way may still be acceptable as long as consistently reads equally wrong for all tyres. I try to compare a new pump or gauge against others . For instance if I know it consistently reads 2 psi lower than the others but otherwise a good bit of kit I might still use it but up my target pressure reading by 2 psi.
