Quote:
Originally Posted by Mitchell
Let us know what you find out. A lot of the guys on here being jerks have never seen anything outside of what they read on the internet. There are many differences between the emissions in US and Euro Spec cars. I am not saying that the M3 falls in this category but some of my cars get far better economy than their US spec counterparts owned by people I know. Both claimed and real life.
Keep up the practical research and keep us informed
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Actually I do believe there is a difference but it's all software. It may be emissions related or fuel related but not due to physical or octane characteristics. It's important to note that European emissions requirements are bent towards minimizing CO2 while U.S. emissions requirements are bent towards minimizing NO. Who knows what effect that has although I believe minimizing NO requires a fuel rich exhaust with heated cats to convert optimally. That could imply lesser fuel economy.