Your owners manual will specify different oil weights for different temperature ranges.
Look at the manual and see what temperatures you'll be using your car, and pick the oil that works in that range.
Personally I switched from 0w-20 to a 0w-30 or sometime 5w-30 weight. 0w-20 was so thin it was burning at too fast a rate for my taste (roughly 1 qt every 1k miles). with 0w-30 and 5w-30 so far I haven't seen any measurable oil consumption.
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