Down grade will always return better MPG. Thats why MPG must be measured in BOTH directions and/or over several tanks.

Cleaned out my Intake Manifold last week while doing some other maintenance and Fuel Mileage has improved as well as performance... 32.2 mpg over 611 miles of mixed driving, highway, city and bumper to bumper commuter crawl... I'm hoping that summer traffic lightens up so that my mileage can improve even more...

__________________
Joe

1998 E300D turbo 240K + Miles
2000 Dodge Dakota 122K + Miles
1992 Mazda Miata Autocross Machine 143K + Miles
http://www.renegademiata.net

Any man who is under 30, and is not a liberal, has no heart; and any man who is over 30, and is not a conservative, has no brains. - Winston Churchill

Hey Guys , I'm new to the mercedes diesels ...I just picked up a little 300cdt and would expect to hopefully hit 30mpg ... I have 3 cummins turbo diesels that are in 25mpg and for a truck thats great , there the old mechcanical injection just like the mercedes .
All the trucks have 2 mods that made a huge MPG difference , a full flow aircleaner and the exhaust being straight piped .
I posted on straight piping on another thread , I am going to leave intake alone on my 300cdt and do a straight piped exhaust and I hope to see 30 mpg out of my little 300cdt .

greg

__________________
1983 300cd

Don't expect to average 30mpg. If you get 27mpg its still very good.

I have a '98 CTD Quad cab 4x4. I can't get over 15 city and 18 highway? So what am I doing wrong.

__________________
1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss

I checked it on my M110 and I got 15MPG in the city, 15 on the highway also.

__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

I suspect a flaw in your calculating or measuring. Getting the same in city and highway driving does not compute.

Sorry.

Tom W

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

What Is an ALDA, what does it do, and Will this help my Gas Mileage?

I wish I could keep my foot out of it.

__________________
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!

I hope to hit 30 with the 300cdt ...Hey Bio300 , I am assuming your a 24valve cummins ...you need the 12 valve truck , sounds like you still have problems ...16 mpg is terrible even for a 24 valve , you should be 18 to 22 , check your valve adjustment and timing , then do a exhaust and air intake might help .
My trucks are 2 wheel drive , one's a dually and 2 single wheel trucks ...all are 12 valve .

greg

__________________
1983 300cd

100% sure the calculations are right. I measured the highway MPG at speeds of 75-80mph, maybe thats why it got the same mileage as the city.

__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

Check my sig. I wouldn't own a second generation 24 valve. Maybe a 3rd, but not a second. Mine is a 4x4 and it has some mods. I have done all you listed and more. I think I have it sold.

__________________
1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss

I think I screwed up with my calculations or just plain forgot I might have put in more than 10 gallons..

Current outlook on this 10 gallon fill up is not high. I've altered my driving habits and such and am looking at 21 mpg's once the light turns on.

I want a more fuel efficient cah.... or a biodiesel reactor... or cake...

If I'm on it I'm proibly 21 ...I'm not the only guy in the mid 20's with the cummins , I would say I did pickup a dramatic increase with the air intake mods .
I am just finshing up at my shop , I am going to pull in the 300cdt ...my superior shift spring kit just came in ...I am going to drop the pan and put in the K1 and K2 springs ...I'm fighting this flare problem from 2nd to 3rd.
I'm pushing for that 30 MPG ...especially with allmost 5 dollar a gallon fuel in the northeast .

__________________
1983 300cd

I might as well throw my 2-cents into this thread. My '95 E300D has delivered over 35 mpg in three of the last four tanks. The last tank was 33.2 mpg. Let's just say as a new member to the Mercedes fold, I am extremely happy. I didn't expect my fuel mileage to be so high. I was expecting 5-7 mpg less.

Any idea why my fuel economy is so high, the W124 chassis? Or, the 606 engine?

On the Dodge Ram front, my '98 24v 4x4 5-spd. truck delivered 19.5 mpg in the winter with 21.5 mpg in the summer. I have no cause for complaint with my 24-valve engine. It has been bullet-proof.

__________________
Nothing cranks me like compression ignition.

- '95 Mercedes E300D "The Great White"
- '98.5 Dodge Cummins 24V 4x4 - "The Green Hammer" (Sold 12-08)
- '81 VW Rabbit diesel w/GTI suspension - "The JackRabbit"
- '00 Triumph Sprint ST for when I need speed