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Old 07-26-2001, 09:35 AM
Johnson Chan
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Hey guys, I got a question for you all, I just returned from Canada and my car is getting 31-32 mpg highway. I looked at the car specs for my car and its supposed to get 26mpg city and 31 mpg highway. This is good news, but consider the following:

1) my injection pump is leaking diesel, I had it rebuilt by the MB dealer a year ago and it started leaking again a few months ago. so basically I am loosing fuel physically

2) I am only running on 4 cylinder according to a compression test a couple months ago. usually when this is the case, i thought your gas milage is supposed to decrease not increase?

So I have two negative factors but still getting the gas milage I am supposed to, I have no modifications or additives in the fuel.

The question, 1) what is going on? 2) what kind of gas milage are other 300D 2.5 turbo owners getting? This was a 3,500 mile trip driving 80 mph, with zero oil consumption on a 295,000 mile engine.

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Old 07-26-2001, 10:30 AM
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My car's at 112k mi, and burns 0 oil. I run it on Delvac One synthetic, and run synthetic tranny and diff fluids.

I drive the car a 60/40 split of in city/highway driving, and the car idles a fair amount. I consistently get 25-27 mpg combined, and I drive the car HARD (I also drive a 500E, so I'm used to getting from point A to Point B in short order). I'd think you're mileage is great, and would perhaps be a bit better if you were firing on all 5 cylinders. And unless your injection pump is really leaking violently, the amount of fuel lost is negligible I'd think.

So, let's get that puppy up to 300k!
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1995 E500 street car
1986 Porsche 944 Turbo S track car
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Old 08-13-2001, 11:47 AM
sgrist
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300d 2.5 mpg

Since getting a 1991 300D 2.5 turbo earlier this year, I have averaged about 35 mpg. On a road trip, I got 38; in town, in the lower 30's. It has 100k miles --just a baby, yes?
I don't know where you got the specs --I have seen 26-40 listed (in the MB Buyer's guide).
This car is sooo much more civilized than my (beloved) '79 300SD, which, with 360k miles, still gets 27 on the highway (albeit noisily).
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Old 08-13-2001, 12:29 PM
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For what it's worth, I just did a 500 mile road trip, 90% highway, all at pretty heavy throttle with 3 people & luggage. Highway speed was around 85 MPH almost the whole way, and the A/C was on high (105 degree temps-a heat wave).

I got just over 29 MPG
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