26 - 30 on my 300SD's.

It is variable with overall condition and maintenance.

I have local owners getting:

* 14 - 18 MPG, Extreme poor condition mechanical and corrosion, 650k miles, it will be scrapped in 2 years or less. Best guess; Restoration parts/labor $40,000.00 USD.

* 20 - 27 MPG, Low/average condition, "being DIY restored", 300k miles. Best guess; Restoration "parts" $2,800.00 USD.

* 28 - 31 MPG, Showroom condition, less than 90k miles. Potential cosmetic repairs; $150.00 USD.


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__________________
ASE Master Mechanic

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D

https://www.boldegoist.com/