You don't need a center cap. The bearings are already protected. Just looks a lot better. You need a 2 1/2 OD 2 1/4 ID Toyota center cap. Go to ebay and look. You WILL suffer a 7-12MPG hit without the center caps.
Science, the best kind, MINE. I rolled down the window at 65MPH and extended my tongue outside after approximating the width and depth of the cap. Then I filled up with gas again and calculated a 10.5 MPG hit. I did have a seriously bad case of dry mouth after my experiment but it was in the name of science, so I feel vindicated.
How about rolling the window up but just leaving enough room at the top to stick your tongue out. Since we will need proof of your tests, you must record it with your smart phone. For accuracy, repeat the process for a whole tank while runing with and against the wind. :/
With all due respect, that would be the epitome of foolishness. I have a degree in Science. Social Science to be exact! Because of this I am going to do an unbiased test. Since animal testing is so well received in science I have enlisted my German Shepard in the cause. He has been extremely reliable in past tests such as "ball deprivation" surgery. Yes, I have had a hard time training him to make the right sized tongue, but he is a trooper. He has promised me that he won't go to PETA and complain if I allow him to be a "drug sniffing dog" although I feel his understanding of what becoming a "drug sniffing dog" and mine differs substantially.
It's not smart to raise the tire pressure more than a pound or two over the recommended pressure. Over pressure makes the tire bulge in the center which leads to premature wear there. Under pressure will make the tires wear faster on the edges. That's why it's recommended that tire pressure should be checked & adjusted often as outside air temperatures will alter the pressure.
NAHHH that is not the case at all ... sure overly over inflate could cause that .. but what toyota recommends is way lower that most OEM tire can take I run 42/40 on my 2012 and did so 3,5 years on 2010 nothing bulged in the middle. Generally speaking you are right but that will no happen by just a few psi...
This is a useful comment, thank you. I have had my 2013 Two for a month and just came from a MINI, so I am VERY used to a hard road feel. I should use that to my advantage in the beginning to squeeze more MPGs out. I am going to guess, also, that a high PSI would make a higher risk for blowouts? (I can check other threads, of course, but in case anyone has a quick answer, much appreciated.)
Run 44psi on all 4s, will run over side curbs at walmart parking space because I dont want to hit idiot 7ft high trucks that prefers the middle divider lane so I try to avoid hitting them on 90 degree turns but end up riding up the curbs. Not 1 blow out yet, even 110 degree summers.
Just went to tire place today for a rotation and they suggested (and did) all 4 at 38psi. Hmm. Maybe I need a real gauge so I can test my own and keep inflated at gas stations, etc.
