You'll find the max fuel economy is a blend of speed and RPM's , the W-123 chassis doesn't like over 55 MPH for top fuel economy , the W-126 chassis is far slipperier in the aerodynamic ratio so it'll get better fuel economy at higher speeds .
When I'm traveling far with SWMBO , I usually keep my W-123's cruise control set to 60 MPH , AC on cold and it gives good economy .
YMMV ! .
-Nate
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