I have a 1990 300D 2.5. I just had the fuel filters changedsoon afterI purchased for the second time. I have got 32 on the two tanks of fuel since the filters replaced. The tank prior to that I got 25. This all predominantly city driving.

Is there anything like driving a diesel? I drove a new E320 Bluetec the other day. The salesperson said they had response from owners that they still wanted a little bit of a diesel hum to the new ones.

 

My unusal high mileage figures were do to carboned injectors.With new injectors I average 27 city and 32 hwy.However either adding MMO or 30% with cetane improver helps mileage.

 

actually i pulled that tornado fuel saver from my buddies land rover (said it did not work for his land rover at all)and your right thatit dont save on gas but.got some improvement inaccelaration (i recalculated and got thatsame 26 mpg)...

 

What's the best you can get out of some of these guys?

 

Ever wonder what would happen if that tornado filter got sucked into your engine? They are pretty flimsy imo

 

I and colleagues at Boeing have about ten mechanical diesel injection Mercedes, four, five & six cylinder from a 1958 190D four speed to a 1987 300SDL. We have tracked over 2 million miles of records. Our conclusion is long term, i.e. over 100k miles, with any one of these the mileages is 23-24 mpg. Yes, we all seem to have a moment or two when the mileage seems to go up, but then the rule of statistics applies itself, and the mileage trends toward the norm of 23-24 mpg. I have never found anyone who can show me 10K miles of continuous records with these wonderful mileage reports. If you are out there, please post your data for those 20 tanks of diesel... nrk

 

Ihave a 1983 240d manual trans with 372000 miles on it and I get 29 to 31 mpg.I just bought the car from a good friend. I know she took very good care of the car and kept the maintenance up.

 

Ive had a 1995 E300D 124 body non turbo 3Lstraight sixthat I bought in 2005 with 38000 org miles.

Slow as hell off the line but it did get an amazing 37MPG Hwy and about 26 city. I calculate by filling and topping off fuel driving a min of 100 test miles then filling and topping again, seems to be the most accurate way.

Over last few test ive noticed a big drop in MPG. Even larger than normal for winter.My last run to PA only netted 26 MPG hwy. i think its the fuel since prices hit $4.00 gal in NY. My water indicators gone off 4 times due to NJ diesel purchased on the NY/NJ/PA border. First year I also had problems starting

Anyone else notice a problem with the fuel lately ????

 

Once you have 10K miles of continuous accurate records you will find that 26 mpg hwy is good... nrk

 

I would have to agree that most things don't improve diesel milage.
I have found with my vw tdi that driving consistantly with no jackrabbit starts or stops.
keeping the air intake path clean(snowscreen and airfilter) and adding powerservice
will keep my mpg consistantly around 43mpg(it's an auto tran).whether i drive city or highway.
powerservice will give me about a 3-4 mpg gain using about 6 oz per fillup(13 -16 gal)
If my mpg drops below 40 i will usually clean the snowscvreen and change the airfilter.
and it will go back to 43 mpg I have gotton 48 on occasion. I would think the same would apply
to a MB .