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Originally Posted by MBeige
Do you know what the drag coefficient is for the W123? Thanks, I'll try slowing down. I adjusted my ALDA back to its "tweaked" configuration, hopefully this will yield better fuel economy.
I'm sure the junk in my trunk will also have to leave should I yearn for better mileage, but I just noticed the difference between original spec ALDA and its tweaked spec -- the original spec gave less miles per gallon.
Also noticed, starting is much smoother with the tweaked ALDA.
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Nope sure don't.
Lower RPMs make the motor run more in the torque band, a few SD owners have installed 2.47:1 diffs and picked up 3-5mpg. Drops RPMs a good deal from the 3.08:1 and 2.88:1 diffs some cars have. Since I dwell mainly on the freeway, it's no big loss to me.
I drive my SD 60-70mph on the freeway, economy is constantly low 28s to low 30 (I keep accurate records of my milage on each fillup)... it's probably 75% highway. I do also have a 2.88:1 diff currently. I use fuel from a high turn-over location too.