BoogieEngineer Posted May 10, 2016 Report Share Posted May 10, 2016 The door's sticker says 35psi. I'm currently having 40psi cold (42psi after running a couple dozen miles) and feel like the ride is a little rough. I might take it down to 38/39 cold. Do you think this is in a reasonable range when considering mpg and tire wear? What are you currently having? Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted May 10, 2016 Report Share Posted May 10, 2016 (edited) Unless you're carrying a full load, I would keep it at whatever the sticker says. Over-inflating causes the tire to ride up in the center tread and it will cause more wear to occur there. Not to mention it will hydroplane more easily, give a rougher ride and easier to lose traction on gravel. There's a reason the manufacturer puts that rating there. Edited May 10, 2016 by enigma-2 1 Quote Link to comment Share on other sites More sharing options...
akirby Posted May 10, 2016 Report Share Posted May 10, 2016 Yep - 35 is fine unless you have a lot of weight in it or you're towing. Quote Link to comment Share on other sites More sharing options...
BoogieEngineer Posted May 11, 2016 Author Report Share Posted May 11, 2016 Oh ok I see. Somehow I perceive 35 as the minimum and I always try to do better than minimum . I guess calling it optimum makes more sense. Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted May 11, 2016 Report Share Posted May 11, 2016 (edited) It's kind of like a balloon pressed down on a flat surface like a tabletop. Press too hard (more load) and it flattens more on the sides (more wear on the edges). Inflate it too much and the center makes more contact, less on the sides. I should also have mentioned that running over-inflated causes road wander, your always having to correct the steering to stay straight. Properly inflated and you have the most tread on the road, making the car run straighter. The rating on the sidewall of the tire is the maximum inflation pressure permissible for that tire and should never be exceeded for long. Edited May 11, 2016 by enigma-2 1 Quote Link to comment Share on other sites More sharing options...
BoogieEngineer Posted May 11, 2016 Author Report Share Posted May 11, 2016 I should also have mentioned that running over-inflated causes road wander, your always having to coerect the steering to stay straight. . This is exactly what's going on right now! Thanks for pointing this out! I'll deflate the tires after dinner when they have cooled off. Quote Link to comment Share on other sites More sharing options...
DRbillZ Posted May 11, 2016 Report Share Posted May 11, 2016 (edited) Never seen an over inflated tire wear in the middle. I've HEARD of it happening. Never seen it. I've run 40-44 in the VWs for years and they always wear perfectly and have no traction problems. Not saying the Edge won't as I have 350 miles of experience with it so far. I've seen under inflated wear on the edges however. Wander? Some call that responsive Edited May 11, 2016 by DRbillZ Quote Link to comment Share on other sites More sharing options...
BoogieEngineer Posted May 11, 2016 Author Report Share Posted May 11, 2016 Never seen an over inflated tire wear in the middle. I've HEARD of it happening. Never seen it. I've run 40-44 in the VWs for years and they always wear perfectly and have no traction problems. Not saying the Edge won't as I have 350 miles of experience with it so far. I've seen under inflated wear on the edges however. Wander? Some call that responsive I did deflate the tires from 40 to 37 last night. I noticed a smoother ride this morning, and a little less (barely noticeable) road wandering. Not sure how this affect mpg. I've read that running 3-4psi above manufacturer's recommendation can increase mpg a tad. As long as the pressure is above 35, the tires are not under-inflated, correct? Or is it something about the tire's spec? I just don't want to do damage/excessive wear to the tires, even when a little rougher ride is the tradeoff. Quote Link to comment Share on other sites More sharing options...
akirby Posted May 11, 2016 Report Share Posted May 11, 2016 Ford determines the best cold pressure for both performance and fuel economy. It's safe - the TPS warning won't go off until you drop to around 26 psi. Even 30 would be safe for normal driving but mpg would probably suffer. 35 or 37 is fine. I wouldn't go below 32 or above 40. Quote Link to comment Share on other sites More sharing options...
BoogieEngineer Posted May 12, 2016 Author Report Share Posted May 12, 2016 Well the problem is that if you follow 35 exactly then when it goes down to 34 you'll have to inflate the tires again, which can happen in a relatively short time period (a month?). If I use 37 I only need to inflate the tires every 3 months. 1 Quote Link to comment Share on other sites More sharing options...
edgesportguy Posted May 13, 2016 Report Share Posted May 13, 2016 Just curious, but why do you need to inflate your tires so often running at 35psi? I'm on my 2nd '13 Sport and live in New England so have a wide range of road temps and run mine at 34lbs and have rarely ever had to add air. I check regularly and they run a couple of lbs lower on cold roads, and a couple of lbs higher in the summer even on the highway. Both favorable conditions and have gotten even treadware on both Quote Link to comment Share on other sites More sharing options...
macbwt Posted May 20, 2016 Report Share Posted May 20, 2016 Run 36psi and works well without an issue. Ditto on over inflation and under inflation as mentioned previously. Quote Link to comment Share on other sites More sharing options...
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