3000 miles unless synthetic then 5 or 6 (same as my 2012 lexus with a simlar sized engine), 17-18MPG (same as my lexus), and "if you have a wrench and a Haynes you're halfway done".

hope this clears up some things.

eta: the 0-60 i am not sure, i'm sure my car with a 4.6 liter is faster and isn't governed at the same speed as the 1985 mustang, but it's not an order of magnitude faster or anything - the mustangs with large engines were always "fast" and relatively safe. I've owned 3 from the 90s and wrecked two and walked away with nary a bruise from insurance totals.

also if i drive intending to "Hypermilage" i can get nearly 30MPG out of my lexus, but i could get ~30 in a Mitsubishi Evo X and a F-550, too. Daily driving is <20MPG on all those. For reference on a 1.6L i can get nearly 80MPG on certain roads, and always above 65MPG. It annoys everyone around me though, so i tend to only do it if i am driving across country, which is the boringest thing ever.