well after changing my O2 sensor i am pleased to report that after trashing it for a week my consumption is still only 8L/100 km and thats compared to 10L/100km when the o2 was fubard
this week im gonna baby it to c if i can get 6.5 like i used to haha awesome
and at cosmo if zinc plating is anything like how they place sacrificial zinc on a boat hull, it doesnt matter where it is as long as it is phisically conected to that piece of metal, its fine, as zinc gives its electrons more readily thru the host metal to the rusting reaction, saving the host
(note that on boats a slab of sacreficial metal is welded to a part of the boat where it will create the least amount of drag
)