So I have no problem getting taxi drivers to turn on the meter. Some drivers are incredibly honest and switch it on before I open my mouth and some not so much. My general rule is I won't take a taxi in Bkk unless the meter is switched on.
Now, I know the meter should start at 35bt and it should go up by 2bt after the first 1.3km and then raise by 2bt every 0.3km. Most of the taxis I used on my last trip were tip top, but a few I got into had fast meters. These fast meters would jump up after 1km. I even had one taxi that was clocking 'stopped time' at the same time as driving which of course caused the meter to rise faster.
I knew the meters were fast, but I didn't bother to say anything. I could have jumped out, but paying the 37 or 39bt meter and then getting another taxi would have ended up costed me. I just thought there was no point in fighting with the driver over something like 20bt on a 130bt ride. (I took a few long rides, like 15km)
My question is this, how do you guys, who live in bkk or visit there a lot, deal with this? Do you suck it up and say TIT? Do you tell the drive he meter is fast and work out a cheaper fare?