when using regular gAS i Go with chevron with techron. i usually get 50 miles more per tank than Arcooooo. for Diesel i use what ever I can find. Sometimes I find myself looking on empty and cant find diesel. When I do i fill up. no difference from mileage. Hey 1BADYFZ we gots to hook up at the Heffs. Mt brother lives a mile or two from you. when you going to invite.....Polk And Foothill He also has a Grato but no Playboy models....