If that's combined driving, then that's about normal. If that's highway driving, then your fuel economy is a bit low.I drive everwhere at about 70 mph and for the last 40K miles I get 20mpg.
jjrodger,1999 with the M113 motor, 5 speed 722.6 transmission, 168k miles. I get 23mpg as a rule. Very rarely less than 20mpg and sometimes as much as 27mpg.
Most I have had from a tank is 450miles. There was about 6litres left in it.
In my experience (formed over 130k miles) the car is most efficient at a steady 95mph cruise.
450 is pretty darned good! I usually get about 300-320 miles in combined driving (depending on how I drive) out of the 18 gallons or so I normally burn in the SL600 between fillups. 18 gallons is approximately the difference between a full tank and the warning light coming on. I never manage to run the tank much lower than that level, because I can't stand looking at warning lights.jjrodger,
450 miles on a full tank of gas, incredible... Are the fuel tanks larger than the earlier 129 or the same??