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Thanks for the fast reply. I will go with 5w20 on the next change. Thanks!
I went with a 50/50 mixture and got exactly zero increase in mpg (01 Nissan Sentra). On the average the increase in milage is .4% nationwide. I don't think its worth it.
Not saying you shouldn't try it, but I would do a UOA and expect
not to expect any benefits.