2005 Mercedes-Benz E-Class fuel consumption

fuel consumption:

  1. how many miles per gallon or litres per 100km ?
  2. must use premium ?

Sedan 27 city/37 highway; Wagon 20 city/28 highway

Yes, required per the owners manual (see pages 465-467)

Thank you

What will happen if I will use

There were 4 different engines offered and a choice of rear wheel drive and AWD in the E-Class, you can’t put premium gasoline in the one rated at 27 city/37 highway, that one is a diesel and the revised ratings are 23 city/33 highway.

The best gasoline powered E-Class rating is 18 city/26 highway, all gasoline powered E-Class cars use premium gasoline.