Quote:
Originally Posted by NickZee
Hi everyone,
New to the forum, have been hypermiling a 2014 BMW 640i Gran Coupe. I see hypermiling more as an Eco-friendly challenge that avoids a few stops at the gas station as opposed to any real concern about saving money.
91 is generally 9% cheaper than 95, and my limited driving so far indicates that fuel economy is about the same on my work run but it is early days in this experiment.
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Which is it? The only reason to run 91 is to
possibly save money.
If I had a $200,000 car, I don't think I'd take the risk for $0.10 per litre. Wheels magazine lists all BMWs as requiring 98, and all European cars across the board require 95 (apparently our 95 is already a lower octane than European 95 - though I suspect this may not be true).
My mechanic had to rebuild a VW because the owner had been running it on 91 since new and at 50K kms it was dead. I'd stick to the recommended rather than minimum.
I run my Euros on 95 or 98, I'd rather not be paying for a new engine for the sake of a few dollars at the pump. Just seems a bit risky to me. I understand that theoretically you should be OK, but it's seriously weird that BMW allow 91 when every econobox needs 95, hence my wariness.