What are you tire presure running?
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2021 E63S Wagon 2019 S63 AMG Coupé 2015 S Coupé Edition 1 1970 Chevelle LS5
What are you tire presure running?
I've just got a new digital gauge, set mine at 40 front and 43 rear.
10K miles on P Zero Rosso, warm tires.
10K miles on P Zero Rosso, warm tires.
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2021 E63S Wagon 2019 S63 AMG Coupé 2015 S Coupé Edition 1 1970 Chevelle LS5
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'10 Tesla Roadster, '06 AMG CLS 55; '00 SVT F-150
see tire alert thread...
we hashed this out briefly on the other thread regarding the sidewall issue, but didn't get to a concensus since everyone has slightly different recommendations depending on their rim size & tire profile.
I'm currently on 20" CEC wheels with 255/30 front & 295/25 rear.
CEC has recommended to be at 4 psi above the stock 19". so I'm at 42 / 45.
I'm currently on 20" CEC wheels with 255/30 front & 295/25 rear.
CEC has recommended to be at 4 psi above the stock 19". so I'm at 42 / 45.
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2011 twin turboed prius
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2021 E63S Wagon 2019 S63 AMG Coupé 2015 S Coupé Edition 1 1970 Chevelle LS5
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2011 twin turboed prius
Car rolls better. I have gotten real good gas mileage when travelling at normal speeds. I think anything between 40-50 is likely beneficial. I was told by my tire guy the maximum pressure will allow the car to roll better and that the fronts should always have more pressure in a rear wheel drive vehicle. On the track I keep the fronts at 51 and lower the rear to 28
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Thread Starter
Super Member
Joined: Oct 2006
Posts: 947
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From: SF Bay Area
2021 E63S Wagon 2019 S63 AMG Coupé 2015 S Coupé Edition 1 1970 Chevelle LS5
Car rolls better. I have gotten real good gas mileage when travelling at normal speeds. I think anything between 40-50 is likely beneficial. I was told by my tire guy the maximum pressure will allow the car to roll better and that the fronts should always have more pressure in a rear wheel drive vehicle. On the track I keep the fronts at 51 and lower the rear to 28
Rating on the tirewall is the most misleading. This is the maximum pressure rating each tire will sustain, but then each PZero is different based on the car it's on, whether it's a 2000+ lbs Porsche or 4000+ lbs AMG...
The car tire pressure rating on the gas door/inside the door, etc... is the same general setting each car manufacturer recommends for the car, not optimized for performance or fuel economy...
Rolling resistance, inertia, coefficient of friction, etc... all play a role. In the simpliest analogy, higher pressurized tires will roll like a marble on a skillet; whereas lower pressure will allow the tires to set and roll like a wad of gum, but it will enable for a relatively stickier interface and may lead to higher handling threadshold. Better rolling with higher tire pressure has proven to improve gas mileage appreciatively, hence I'm playing around with it.
