Quote:
Originally Posted by Raptelan
Why do you say the 240's get so low?? I thought even 300's should generally get above 30. My 240 got much higher. I also lived in an area which was quite hilly at the time, which isn't the case now. The 240 sucked on hills, but mileage was good. I have new fuel and air filters, brakes don't drag, I recently checked/adjusted valve clearances (they weren't much off to start). Don't know how good the tires are for efficiency but they're Bridgestones and less slippery in rain than some of my other cars' tires though not as good as the set of Michelin Weatherwise's I have (I suppose better traction means worse mileage). A/C has a broken line in the 200, so it's never running, however if I switch it on it bogs down the engine so I don't think the belt being attached is an issue in general. Could it be that because I didn't do much maintenance on the 240 that it's fuel injectors ended up more clogged thus getting better mileage or something? Or maybe a previous owner had tuned it somehow? The 200 has a 3.92 differential - I've been thinking of putting one from a 240 on it which is a bit lower. How do you differentiate fuel quality/type? There's never more than one option for diesel at stations...
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In my 240, folks I've talked to, and all the numbers I've seen here show 240s getting the numbers I posted. I'm usually pretty skeptical of folks touting much more than low 30s in any 123 diesel Benz, and I know I not the only skeptic. That's not to say it can't happen it's just not the norm.
As for fuel, you're getting different fuel types weather you know it or not. Winter diesel is different than diesel sold during the rest of the year. Winter diesel yields lower mileage due to the additive put in for winterizing the fuel. Fuel quality has also changed over the years, and also differs from one stations to another as well as one state to another depending on state mandated required fuel additives. I can't really speak to how these affect mileage, but they surely do just like gasoline. Biodiesel is also something to think about. It has less BTU's/gallon which causes a loss of fuel mileage from 7-10% if you're running 100% bio. Straight veg oil follows suit. Some states have also mandated that small amounts of biodiesel to be put into all diesel. Though small amounts 2 or 5% probably doesn't affect mileage.