Do they have hybrid cars for better fuel economy?

Yeah they do, and JJ said there are SUV that get good gas mileage

Yes, however its best to call or go into each location as the high number of cars/suv/trucks that go out each day make it hard to nail one down unless you were to reserve one in advance. You need to talk to a customer service representative to make sure they do have one and can reserve one for you.

I have rented alot of small suv that get close to 40 miles per gallon