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Give some 0W-20 Mobil 1 a try next time around.
(Maybe you know this, but...) 0W oils give better mileage by flowing easier - giving better mileage - at low temps and all the way up to the temp required to give its top (20) rating. 0W-20 Mobil 1 gives the same protection and warranty coverage as 5W-20.
After it's hot, there's no mileage benefit.
I change to 0W-20 Mobil 1 in my car as soon as the temps start to drop, mostly for protection during (really) cold winter start-ups, but there is most likely a mileage benefit as well.
Jay
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