optimum

I recently changed the thermostat on my C124 e320 coupe, thinking that the old one was sticking. It had been running at about 80 according to the gauge; now its running at an indicated 75, even on long fast runs. The cabin heater is a little slow to reach the comfort zone, but otherwise I see...

I'm doing motorway mileage two to three times a week and not fussed at what speed I travel during this commute so wondered what is the actual optimum speed for good fuel economy. E320 petrol. Sent from my iPhone using Tapatalk

Hi all, just bought a w210 e200 for a quick runaround while i restore my w124 It has the m111.942 engine. Quick question, what speed does the car operate most eco at for fuel on the motorway? Is it the standard like 55mph or is it different on this car? Thanks

Following on from the 220cdi fuel con thread, *** suggests keeping a diesel under 2200rpm for best economy (thx ***). Seems about right, but I had always understood that for pure economy the best speed was the lowest you could run at in top gear. If you actually want to get anywhere - i.e. time...

Hi all, My E320 W210 normally idles around the 80 degree mark, but during recent bout of warm weather crept up over 90 degrees on occasion - particualrly when not moving much in traffic !!! What is the optimum temperature for this car please and what are acceptable tolerance levels before i...

What the optimum mph should I drive to get the optimum mpg in my 1997 W202 and 2001 W170? Is it 55mph or 65mph? There are no trip computers in either.