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I use Mobil1 5w20 in my Civic. Mobil because it's easy to find and high quality. (I'm not arguing which is best, but it is good). 5w20 because it's what the other car takes and I stock only one bottle in the garage. A little mpg bonus from freer-flowing oil can't hurt. My commutes are short and most of the way is a "cold" engine so the 5w part applies more than the 20/30 part.
I switched to synthetic and the lower viscosity at 150,000 miles and it still doesn't burn any. Now at 188,000 miles.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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