Hmm, I'll have to have a think about that. I'm one of those who doesn't think RPMs make a big difference in fuel economy in a diesel.
5th gear in a 2.2l 190D is highway only and only above 65mph, I wouldn't mind going lower in gearing but taller gears are gonna eat up all my get up and go... We're not talking about a seriously quick car anyway.

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Sadly Benz-less