Taxi driver was having a (not quite heated) discussion with my Thai GF last year about which route to take to our hotel and whether to use the meter or not. He became quite compliant when he noticed me taking a photo of the cab number on the door
The general rule of thumb is that 2 standard drinks in the first hour will raise your BAC to 0.05%, and 1 standard per hour thereafter will maintain that level.
examples:
330 ml Singha is 5% = 1.4 standard drinks
red wine 100 ml = 1 standard drink
white wine 100 ml = 0.9 standard drink
spirits (40%) 1 nip/30 ml = 1 standard drink
pre-mix 5-7% 275 ml bottle = 1.1 - 1.5 standard drinks