Just picking up on what Peters said... Last weekend, we were down in Edinburgh, driving back and taken the scenic route, which seems quicker (taking the Tay Bridge avoiding Perth), I picked up a screw in my rear tyre...... Whilst driving I got the bong of death, so pulled over rather quickly and kicked the tyres, all looked good, so thought I’d check pressures, o/s rear down to 26psi.... having set tyre pressures a matter of days ago at 33psi Whilst checking tyres I noticed the screw, mid tyre between the treads, still shiny and almost gloating at the pain in the behind it caused! Being equipped with compressor and spare wheel got me out the preverbeil.... ( & latter went on to avoid running on flat & destroying an otherwise good tyre) Whilst not feeling confident to change at the side of road due to 70mph traffic, I opted to inflate tyre to 36psi, drive the short distance to allow turn off and changed wheel on some random strangers drive.......... (fortunately they were appeasing) So outwith the bags and on with the space saver spare wheel and a slow journey homewards raging at the thought of renewing an 8mm 315/35 R20 Bridgestone Rft......... fortunately tyre was removed and no sign of damage, so repaired.... had it been of lesser tread I’d not even consider repairing! However the point I was making, the old tried and tested methods still prove effective of pressure loss, the E70 has the Abs reluctor ring warning system, on this occassion it saved me dearly...... to the sum of £320! (Back in the pocket) But, I’d does ask the question how many of us do the honourable weekly/ monthly check, but do we reset and initiate the system after each check! Fortunately on this occasion I did!