It's possible that the Amsoil filter has more filter media to hold the crap before it reduces flow too much. The Pureone's are very good filters, of course, especially when you consider the price. I can get one for my Jeep for $6.50.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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