i've just completed a 3wk stay in thailand, and in 6 BKK to/from hotel taxi trips (sukhumvit/conrad and mbk areas) my metered fares came up between 137 and 187 baht. fastest door to door time was 18mins, slowest 40mins. the 187/40 ride was during rush hour, where our saavy cabbie ducked and dodged the "expressway" (jammed) and rerouted towards bang na (sp?). even with a healthy tip, 200-300 baht should do it.