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Old 02-24-2018, 03:40 PM
tjts1 tjts1 is offline
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Join Date: May 2009
Location: The slums of Beverly Hills
Posts: 8,057
Quote:
Originally Posted by Diseasel300 View Post
Did you change the rear end ratio? A/C? Tire pressure? I do 29-30mpg highway in the SDL, I don't think there's any real room for improvement in that barge, but the 124 has potential.
Rear end ratio is still the same 2.64 but with 5th gear the engine is turning 20% slower in paper. In reality it's closer to 25% slower since the stock 722.3 lacks a locking torque converter.
I use AC in SoCal almost all the time.
The 300D weighs about 500lbs less than the SDL and has a better drag coefficient so I don't think the 126 body could match these numbers but a manual swap should offer a similar % fuel economy gain.

Before 5spd swap.

After 5spd swap.

Revs @ 70mph
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