98 Civic DX hatch stock 280k
27-35 mpg depending on how many bicycles on the back and how hilly it was. 5th gear was pretty much unusable except for flat ground on the interstate.
now has B18C5 27-28 mpg 80% highway and really goes up hill!

89 CRX SI B16A
30 mpg 80% highway

of course both will get much less if run hard