you've got a good 3FE. 14 mpg is pretty good for a 3FE doing 70 mph! and doing 70 mph steady on anything but a flat interstate is pretty good for a 3FE!
is this a JDM or north american 80?
if the seats are manual the leather is definitely not factory, but dealer or regional office added. sounds like they did a nice job. there were no lexus 80 series until the lx450 in 1996, but when the 80 came in for the 1991 model year dealers started adding options like leather to get them off the lot given the high sticker price, and toyota eventually responded by adding leather and a fancier interior in 1993 at which point cloth seats became extremely rare. toyota originally packaged the 80 in north america just like the 60 as a plain utilitarian vehicle (in 1991 there was a steel wheel no fender flare, no sunroof base version that appears to have sold almost no units) and left out a options on all models like lockers and full floater disc brake rears available in japan to keep the price down. the price was still too high so they had to turn it into a luxury vehicle and jack the price up. if it is north american your 91 would originally have had checked pattern cloth seats with vinyl sides.
is this a JDM or north american 80?
if the seats are manual the leather is definitely not factory, but dealer or regional office added. sounds like they did a nice job. there were no lexus 80 series until the lx450 in 1996, but when the 80 came in for the 1991 model year dealers started adding options like leather to get them off the lot given the high sticker price, and toyota eventually responded by adding leather and a fancier interior in 1993 at which point cloth seats became extremely rare. toyota originally packaged the 80 in north america just like the 60 as a plain utilitarian vehicle (in 1991 there was a steel wheel no fender flare, no sunroof base version that appears to have sold almost no units) and left out a options on all models like lockers and full floater disc brake rears available in japan to keep the price down. the price was still too high so they had to turn it into a luxury vehicle and jack the price up. if it is north american your 91 would originally have had checked pattern cloth seats with vinyl sides.