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Hmmm well you don't have to worry about which gas u get cause they all do the same thing, add additives to get LESS mpg out of gas like detergents...
Best kit to get period xetronic digital hid's. Worth every penny about 350-400 after discounts
Add on tach and or scanguage is your friend
Usually the issue has to do with shared voltage if its 2 contacts on the valve ballest
Takes max 10 min to do it
It's called dynamate