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I used to use Amsoil in everything I owned. I just got really tired of the shipping costs and general unavailability of the product. Their upper end oils are second to none. I switched to M1 and went on my way........
I am running amsoil but I cannot comment on mileage. My truck gets less than 10k miles per year because I am usually in a company vehicle. I tend to change my oil once a year.