Japanese Taxi Drivers

I realize that i am a foriegner. I realize that i dont speak Japanese. But DAMN IT! What is the point of going 20 miles per hour or less in a taxi? And its not for the money because some, and i mean some taxi drivers drive like they are supposed to. Which is like what 40 to 50 miles per hour. Which i guess is speeding to everyone else. I would just appreciate it if they would speed it up. I know they probable hate Americans. But fuck! Dont pick us up then. I might as well walk back to my ship long as a damn taxi takes. And to top it all off these fuckers act like i cant count and ALWAYS short me at least 100 to 150 yen. WHAT are you about to buy with 150 yen? A donut? What? Makes me crazy sometimes......but...this is just a thought.