Ever driven a 400E?
It'll run away from a M103.
And gets about the same highway mileage as the M103.

Loved my 400E, but boy that engine is tight in a W124....

By the way, I am fond of inline sixes......

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles