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32mpg is very decent. My highest was 34 from ATL -> FL (downhill) in a hurricane (35mph on interstate) in my W123 with 2.88 rear and manual trans. I do not think you will get more than 32mpg without a different engine. More spool earlier on isn't really going to give you better fuel economy, you will be using more fuel earlier. If you want good fuel econ trade your SD for a 190D or something much newer (40mpg with 93 e300d for instance)
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