Re: Tire Air Pressure to 40psi
The statement is "reduces tire drag". The tire drag coefficient is reduced by 15% and the math works. Tire pressure is increased by 12%, re-check your figures.
Got a life!! 
Bob
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2009 Tacoma PreRunner Crew Cab. Wife's Car
2009 Camry Hybrid, Mine :
2008 Harley Davidson Screaming Eagle Road King-My Bike
2005 Harley Davidson Deluxe-Wife's Bike
1998 Honda Accord EX (Daughters, but I bought it) 
2009 Corolla LE (Other daughter but she's paying for most of it)
Photos located at http://community.webshots.com/user/currybob
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