and kracka i believe what blizzard has to say about the amsoil getting better gas economy.
like i stated before my pt cruiser usually gets like 22-23 depending on how i drive it(not much change day to day)...
when i switched to amsoil i am now getting 25-26...i believe it has to do with how thick the oil is when you start it up and the lubricting properties it has at 40 degres and below outside!!!
if you take a bottle of castrol and a bottle of amsoil and put them in your freezer overnight and poor them out the next day the amsoil has thickend up at all, where as the castrol looks like lucas on a hot day!!!
that and the fact that castrol is only rated to 5k and amsoil is rated to 7.5k with a standard filter and 15k with an amsoil filter my play a big part in the difference of blizzards numbers...
