I am in the market soon (once I have sold my Porsche) to buy a Mercedes CL but like to keep an open mind and look at alternatives, my budget is something like up to £16,000. The E Class coupe Blue Efficiency diesels look tempting while not in the same league as the CL's, they seem good value and cheap to run. I can accept the expense of running a CL 500 which is of course petrol but wonder if a diesel engine would suit me as my commute to work is only 9 miles, but with a diesel engine it just has not enough time in a 20 minute drive to work to reach it's full operating temperature which has been an issue I have encountered before. I don't really know what this Blue Efficiency thing is I must confess, so can you please educate me and advise if an E class coupe with these engines would serve my purpose and which one is best. Many thanks.