The bad press BP has been getting lately has me thinking about why they refuse to join the Top Tier group of gasoline brands that certify the amount of fuel injector cleaner in their product (they likely include it anyway?). But, I'm also wondering if the F.I. solvents needed for modern cars are possibly corrosive (along with alcohol) to the viton, etc. carb. components that keep failing? Anyone familiar with the chemistry?

Is it better to favor T.T gas and keep the internal carb. passages clean, or avoid it hoping to prolong the life of rubber parts?

6 VOLTS/POS. GRD. NW INDIANA