fd1 owner here.. 1 full tank gives me 420~450km with average 70% city drive, 30% highway drive..

but honestly la, if u dont drive like fast and furious style, then go for fd1, the power is good enough.. if u drive like fast and furious style, go for fd2 or fd2r..

but still, back to basic, go test drive both 1.8 and 2.0 and see which 1 suits u better.