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I have started using Archoil also. I average 18.3 mpg on my 2009 750i but most of that is highway miles. I use Chevron Techron Fuel Cleaner every month. I have not seen any increase in gas mileage but it does cold start better. I also have what feels like a random miss in the engine at idle but it is not all the time. I use the oil treatment too.
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