I was in Tempe for a long weekend staying at the aloft hotel 1/14-1/17/2011. They recommended Clean air cabs and we thought they were great the first 4 times we used them. The last time we got ripped off. We asked for a ride from our hotel to the Arizona Mills mall 5.7 miles away if you just go down Rural Road. This guy took the 202 to the 101 to the 60 doubling the distance and cost of our ride. When I asked the guy why he went this way he got real nervous and stopped talking all together.
We called another cab company (discount I believe) for the ride back and were able to get back to the hotel to pick up our bags and get dropped off at the airport for the same price we paid just to get to the mall.
So if you get into a clean are cab and your driver is a thin, North African gentleman, you better check your map before the guy starts driving.