Does anyone know if Mercedes Benz built manual transmissions with different gear ratios for different markets. I have a 2001 C240 with a six-speed manual transmission. However, I find that I am using one gear higher than my Mustang. Also, the motor runs at 2,500 rpm when I am cruising on the highway at 110 kph in sixth gear. This seems quite high to me considering that the vehicle should be able to run on the autobahn.