1.8 and 2.0 different rate, and sometime the mileage and car age
also play a part in the rental prices. Some hirers really keep the
taxi very well maintain, comfortable to drive, but charge abit
higher and also very strict on timming and cleaning of taxi. Some
hirer do not care much about the taxis, seldom go servicing or
change parts, usually these hirer are very ching chai one, $60/$70
also can negotiate. You call them you be late, they also nevermind,
or cannot drive for certain days, also nevermind.
So, give and take, weight and balance the pros and cons. As you
go along, you will learn more about people.