Hi to all and thanks for the fast reply. I have always used Premium in all my cars...

Anyhow, can someone explain compression ratio and what determines it; how fuel is related... many thanks...

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sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen