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Originally Posted by gumby
I agree with Chris, here.
Check your tire sidewall. Most of these tires are rated for either 44 psi max, or 51 psi max.
And give yourself some time to be trained by your new car! My mileage started out at 41-43, but now (4000 miles on car), I am cranking out maybe my first 49 mpg tank. My last two tanks have been my best. I think you will see improvement as you learn, with or without high tire pressure. BTW, I have the Dunlop SP31 tires, and use 37 psi. This seems to be a good compromise for me.
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thanks for your feedback, steve. my sidewall says 44, but as you can tell, i'm jonesing for better fe, and at least one hypermiler, excel, has had good results from increasing into the 50s without any safety issues, and there seems to be some controversy over tire pressure on this site. have there been any catastrophic failures due to hyperinflation of tires on hybrids?
as of today, i have 408 miles on the odometer with overall fe of 40.3.