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Our '03 Accord V6 automatic returns around 23 mpg with our usual mix of around town and freeway driving and moves up to 28-30 MPG on long highway trips. I've not been able to detect a fuel economy or performance difference when going between 5W-20 and 5W-30 (Havoline synthetic from a clearance sale) motor oils. We have about 65k miles on it now.
Fuel economy drops like a rock if you use all of the available power though.
04 v6 about 70k for miles. I too have not noticed any difference between 5w30 and 5w20. I have noticed the following difference.
-About 3% less mpg using 10% ethanol.
-lose 4-5% mpg with tires at 31-32 vs 35-36
-lose about 3-4% @80mph vs 72mph.
My highway average is about 29mpg
Drops like a rock if you let the horses run.
