What sort of gas mileage do older bikes get?

[B4N M3]

I want to get something old and slow and comfy for just cruising...(been wanting one for years, so it might be years 'till I actually get one)

http://vancouver.en.craigslist.ca/mcy/1127960218.html

I REALLY like bikes that look like that....what sort of gas mileage do you get out of something like that?

or like this?

http://vancouver.en.craigslist.ca/mcy/1128498282.html

something along those lines...thanks

[pheonix165]

i have an 84 vf750. for $15-$17 91oct. i get between 150-200km/tank. perhaps that will help.