| E-85 will increase your fuel consumption by 25-35%, due to less energy available in each gallon. So do the math. It rarely pays.
E-85 has been known to very slightly increase hp, for whatever that's worth.
To deal with some of the other questions, our C300 Lux averages 21-22 mpg in suburban driving, and 26-29 mpg on highway trips. I've never used anything lower than 91 octane, as per MB's current and long-time requirement for premium fuel.
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John R.
Vancouver WA
2008 C300 Lux
White, Black Tex, P1, Auto.
History: '69 220/8 [OSD]; '71 220/8; '73 SE 4.5; '76 300D; '77 240D; '78 240D; '79 300SD; '81 300SD; '84 190E; '86 190E; '89 260E; '94 C220; '98 E320; '02 C240; '08 C300
Last edited by jrct9454A : 11-21-2007 at 03:58 PM.
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