earlier heard my pax said, "tdy take cab all mercedes taxi."
seems like bo std limo driver alot hor. I am one of them. Coz
when they flag I just pick up them.

normally, when you step up from driving normal cabs....
you will continue your routine (sweeping) to your mercedes cab,
which is not wrong.
As I did mentioned before,
if you are comfortable sweeping the floor or taking normal MDT
calls, then you have to work an additional hour just to generate
the same revenue as compared to your normal cabs days.
Yes, probably you may saved abit on the diesel run on your
mercedes cab as compared to the other normal cabs, but it won't be
much.
Try to look for other alternative, by joining a limousine group
(walky talkie), ie, try to get limousine-related jobs.