1959 180D 35mpg Diesel
1967 230SL 18mpg Premium Gasoline

The 230SL is also injected, with six-plungers. Both manual gearbox, though column shift on diesel.
I believe the 180D about 2400lb, the 230SL about 2830lb/2750lb without hardtop.
The w113 wants to rev high, of course. But then the w120 revs high too.

Much of this is on mountain roads. Did I mention the SL has 3-1/2 times the HP of the D?

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PagodaLOVER
1967 230SL, manual
1959 180D, manual