Actually you should be checking air pressure every second refill of your tank. If better check on every refill. This is good practice just in case your tyre hit a nail and have slow leak.Maybe these low end Good Year sucks. Seriously, I think my front Duraplus indeed sucks compared to the Vikings at rear. I can leave the Vikings untouched for long and their air pressure still looks good. For the Duraplus, around 2 months you can start to see the tyres looking like slightly running out of air. Even the Dunlop SP Sport J3 on my brother's Myvi don't need to fill in air as frequent as Duraplus. One thing I like about my Duraplus would be that it looks nice to draw white lettering to it.
From Germany? Must be very expensive back then when new. I thought Good Year is from USA. The new Asy 3 is also from Germany?
Let say you refill every 2 weeks. You pump 210kpa on all 4 tyres. On your next check you find 3 on 200kpa and one on 180kpa, then you know something is wrong already.
If you check every 3 months, 3 may be under inflated and one if kena nail could be nearly flat.....lol
Asy3 I think from Germany. I have not seen it physically yet....