Originally Posted by chris_m
I'm just wondering what other members are getting from their slk in terms of fuel consumption. On my first 250 miles i've got an average of just over 23mpg. Will consumption be better as the engine wears in?
I have been driving my SLK for 10 months now and I am extremely satisfied with its fuel consumption. Actually, the SLK has been the least petrol-hungry car I have ever owned.
Since your car is still in the running-in period, it is normal that it consumes a little more. Here are some causes of higher fuel consumption:
Excessive city driving (or extremely slow driving)
Bad tyre condition (or use of winter tyres)
Using the A/C
Very cold temperatures
Some SLK owners say that driving the car in the S mode (as opposed to the C mode) is more fuel-consuming. I tried both. The difference is insignificant, if any. Hood-down driving is not significantly more fuel-consuming either. Of course, if you drive wrecklessly in any mode, you will pay the price!
Here are my personal consumption figures (you must take into account that I am a rather conservative driver):
In warm temperatures, I get an average 7,8 litres/100 km (city/motorway). That is about 36 miles per Imperial gallon or 30 miles per American gallon. On a good motorway, if I drive reasonably (100-120km/h or 60-75mph) I can get 7,4 litres/100 km (about 38 miles per Imperial gallon or 31.5 miles per American gallon) which is an excellent fuel consumption considering the weight of the car and the type of engine (mine is a 350). In colder temperatures, with winter tyres, my city/motorway average is 8,5 litres/100 km (about 33 miles per Imperial gallon or 27.5 miles per American gallon). City driving alone is much much more fuel-consuming. I get an average 11,5 litres/100 km (about 24.5 miles per Imperial gallon or 20.5 miles per American gallon). And of course, driving in extremely slow traffic with the A/C on can increase the fuel consumption considerably.
I hope this will reassure you a little! Have fun with your new car!