I have a ‘23 Lariat originally fitted with the 115T 36psi, but I just switched to Michelin LTX MS2 116H rating.
I would fill it to at least 42. I have my Generals at 46 and Ford recommends I have them at 42.
Compared to the original tires...which I really never heard at all, there is now noticeable tire whine and is the one downside to installing these. The whine is worse when they're new though. I've gotten used to it, and it's not as noisy as some of the trucks I'm passing on the highway that you can hear from a quarter of a mile away.
I have the E rated Toyo Open Country III EV tires and this is just not true at all. I run about 45 psi in these tires and the range loss is about 5% from the stock tires. I have about 8000 mile on them so far.I didn’t get those. That’s the E load for those looking to rock crawl. Stiffer sidewall etc. 116T XL is a direct replacement for the OEMs. Light off-roading. Same ride. Same PSI. You are swapping the high efficiency for all terrain tread. E tire reduces range 10-15%. 116T XL about 5%.
The answer isn’t so straightforwar. Yes, should be higher ( at 42 cold ) but more importantly need to have dealership set TPMS up to the 42 rating. Then you need to mark the driver post with updated info for the change. This is important for you and others. If this step isn’t followed, likely anyone servicing tires or performing rotation will set pressure to lower rating based on pillar and computer if it’s a ford dealership. Another important item, if you want TPMS to work, it needs changed. The system is setup to show a low tire notice with a 5 PSI lower than set point. This will now take 11 PSI to react if not updated. It’s all in what your goal is. I’m trying to keep truck as close to stock as it ages. I like the lower rolling resistance of the 116T rating and I don’t think it rides bad because of them. The reason I know what this issue is my truck was one of the many shipped setup for 115T tires but had the 116T installed by ford assembly plant, as well as the corresponding pillar label matching tires. I had a nail cause a tire to drop pressure and TPMS never went off. I hadn’t noticed and it went to its first service. The tech told me 3 of the 4 were set at. 45PSI and the last was at 36PSI. They noticed during rotation the tire looked a little low, so when they were done were resetting all the pressures and found the low tire and nail. It was all fixed when I picked it up, but took longer than normal. They were concerned TPMS hadn’t worked as intended and investigated it and reached out to Ford. After direction from BEV team, issue was corrected. I recieved the recall/ TSB in mail about 4 months later.
Any idea if the TPMS update could be done via Forscan?
I don’t know what the dealership used, sorry. I know they updated two different modules to fix the issue. The first one was straightforwar, just like ice trucks. The second was at BEV team request and that fix the issue. Only doing the first correct PSI set point, but if air was let out of tire still wouldn’t set alarm on dash. The second module updated corrected that issue.
The GOM will self correct after a few trips. I think it’s combination of miles traveled and number of ignition starts. This way it can only correct so much at a time, keeps it from very suddenly being very far off. I’m not sure about changing tire size with Forscan, I believe what ever you do, the GOM will catchup at some point.
