You should be able to look at the general shape of the car and get an idea if it gets better MPG. Any small car with a good engine should be able to get high MPG with aero mods.
I know several people here go for the lean burn engines, so might be a good thing to try to get.
Finally, try to find a manual, by design they are around 10% more efficent than typical autos.
Never buy a car that you will hate, if you dis like the car, when it breaks you won't want to fix it and will probably be looking for another. Target one you can keep for a long time that has a good rep for being reliable (Honda, Toyota, etc)
Researching common car problems can give ideas about the car as well like Corollas using quite a bit of oil between oil changes (93-97 issue).
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