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Yeah, I can see wanting a shorter gear for performance. It would be cool to have a 617 spin the tires. It would be one of the very few that did.
In reading all the final drive posts, the consensus is that a 2.88 is as tall as you can go to get better economy. the 2.47 only provides a quieter ride....apparently the fuel econ improvement to final drive relationship is asymptotic and ends at 2.88
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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had) 
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head 
99 Suzuki Intruder "Trudy" @ 45 mpg
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