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Old 09-04-2015, 06:33 AM   #5 (permalink)
oldtamiyaphile
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Quote:
Originally Posted by NickZee View Post
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.
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.
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Last edited by oldtamiyaphile; 09-04-2015 at 06:53 AM..
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