harkgar

I have the same car with 10,000 miles and I got on a long run pretty similar to yours and got over 39 mpg (Imperial Gallons) without a sweat (air-con on).

You need to check out your engine for fuel leakage etc.

harkgar

I forgot to say that I have 18 inch wheels on and 275 tires around so it is not the tires.

pinebaron

Here is an update after 4500 miles (5 weeks)
Best mileage is on my way to work mostly at 80mph (65miles) highway and 30mph local (11.5miles): 32.8mpg
Same trip in the evening; traffic: 29.8mpg
Overall 462 miles consumed 14.649 US gallons (at fill up today)=31.54mpg (US)

CE750

that just doesn't seem right, unless the bluetech is a lot less efficient than the 3.2 I6.. I'm getting 35mpg on my worse day on the freeway.. and 40 on my best. Interesting.

rbordel

I've been keeping a record of miles driven and fuel consumed by my 2005 CDI since January of 2005 (at which time the car had 17454 miles on it). Fuel economy since then until the present has been 37.7 MPG over 30648 miles. My best tank has been 43.55 MPG, and worst tank was 28.95 MPG. Longest distance driven on a single fill up has been 850 miles. The car has the OEM 16 inch wheels and the original Michelin MXV4+ tires, which I keep inflated to 40 psi. The tires are rotated every 6500 miles. I keep the A/C on auto and set at 72 F. Most of my driving is during warm weather when the A/C would be cooling the interior.

Most of my driving in this car is long highway trips, and I stick to the posted speed limit (usually 65-70 mph, but can be 75 mph out west.) I've noticed that in addition to speed, my mileage is sensitive to wind direction, whether it's raining or not (rain hurts fuel economy), altitude (higher altitude improves economy,) and possibly fuel quality.

Wolfgang

Mercedes just announced today the specs for the first Bluetec passenger vehicle for Europe. The E300 Bluetec is to retain the same consumption as the European E320 CDI of 7.3 liters per 100 kilometers (combined city and highway, NEDC test cycle). This translates to 32.22 MPG in US numbers. I suspect the European Bluetec utilizes a different rear ratio of 2.47:1 instead of the 2.65:1 used on the US version, which may explain the slightly better overall consumption figure there.

I put a blurb here: http://www.whnet.com/4x4/diesel.html

Mnymaker

Yeah but your in Texas (flat land) I'm in the trifecta of Northern VA, W.Va, MD, DC (hill country) where its constantly up hill and down hill even though I drive 80 miles one way everyday.

If I drive sanely I can squeeze 32 mpg out but I have to make a effort at the very end of the trip to not accelerate too hard from a stop sign in town or I lose 0.1 mpg at each stop sign.

I'm thinking of placing my factory 16" wheels on the car for the winter anyway so I will see if that helps my mileage then.

pinebaron

I just crossed 5000 miles in my E320 Bluetec in exactly 6 weeks and mpg increased immediately while I was driving to 34+ mpg from around 30 mpg on the way home today. I was not aware of a Break-In setting in the car.

rbordel

I've made 2 trips to VA in the past year. Here is the data for the time I was in Virginia:

Trip 1:
Tank 1: Fancy Gap, VA -> Harper's Ferry, VA -> Washington, DC -> Fredericksburg, VA: 690 miles driven, 38.48 MPG.
Tank 2: Fredericksburg, VA -> Roanoke, VA -> Nashville, TN: 777 miles driven, 40.57 MPG.

Trip 2: Knoxville, TN -> Galax, VA -> Knoxville, TN -> Chattanooga, TN: 641 miles driven, 38.47 MPG

CE750

Impressive records you keep. I agree however, 37+ mpg is down right easy to do if you drive the posted limits.