Quote:
Originally posted by 300sd2000
I have a 300SD (126) 84 and have never seen MPG in the upper 20's in a long time. I have owned the car > 10 years. (sometimes low 20's on a long highway trip). I used to see mileages in the low 20's but it has been several years since that.
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I've kept good records of mine over the past 18 months since I bought it. I consistently gets 26-28 in the warmer months. If the A/C is on most of the time, it will see the 26 number typically. On a road trip where the engine does not get shut off for 300 miles or so, it will get up over 28.
Now, in the winter, all bets are off. I falls to 23-25 and stays there until the winter fuel is changed back to the summer fuel.
It has no EGR and larger 215-70-14 tires. The mileage listed is not adjusted. In reality, the vehicle travels 3% farther so the fuel economy would be better by 3%.
The figures are all highway and virtually no city travel. The highway speed is typically 65-70. If the speed of 70 is exceeded for any measureable length of time, the fuel economy will drop a couple of points.