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One option is to try a 0W-30 oil like Mobil 1 in place of 5W-30. Not sure how it's figured exactly, but the claim is that the 0W-30 will flow easier than a 5W-30 - even when it's at 30-grade. It claims to meet all warranty requirements of the 5W.
Any time it's cold (15 is cold) the 0W will be a better choice than the 5W for reduce engine wear at start-up. Not sure if you'd actually see a mileage improvement with it (they claim up to 2% increase).
Going to 0W-20 Mobil 1 would probably give you the best MPG all around, if you feel comfortable running it over 30-grade.
Jay
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