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My month-old C2's tires are 35/33 psi (dealer set) as recommended in the manual and on the door plate. However, 2 of the commenters in this thread have increased their psi to the max of 44 found on the tire or somewhat less. Will shortly embark on a 2800+- round trip and seek advice as to increasing my psi. A 400-mile round trip two weeks ago involving rural, city, interstate, & mild eastern WV hills (w/600+ lbs. body weight & 65 mpg max speed) gave a computer avg. of 55 mpg. Not bad if tires were somewhat under-inflated. Appears that I should add some psi for even better mpg as well as safety.