i drive about 80-100 miles a day... i run it on 87, and get about 20ish mpg... thats some stop/go... and a good bit of highway at about 90-110. it ALWAYS gets atleast 280 to a tank, usually 300ish... and i fill up about 3 times a week, maybe 4

 

sorry for the self-bump back to the top but my dad wont stop asking me how long a 4.6 will last, mileage wise, without needing major repairs. i really don't know, but i told him "long enough" since im buying the ar for myself anyway haha. but im sort of curious myself too. thanks.

 

Their pretty bulletproof! I'd say you'll probably start having to think about overhauling it, of course depending on how you drive the car, at around 150,000!

John