I am doing yet another tune up on our tired but reliable 96 F250 with a 5.8 gasser. I usually use Autolite stuff and it has done well. But I am a creature of habit and fear change so I have not tried other brands. I am not interested in running hypo stuff because this is a mostly stock 5.8 that used as a daily driver and towing down a highway. What I am interested in is good fuel mileage and longevity. I do not want to be swapping this stuff out in six months. Anyhoo, who do you all recommend and why?