Originally Posted by XJsss

Expatjag I was wondering what tire pressures you were running in the Pilot Super Sports? Jaguar recommends 41psi for the XJR which runs the larger sizes, currently I have mine set at 40psi and find great stability at 110 (best I can do for short sprints when cops are not around). I have been cruising at 85 and all feels perfect, but of course they are new with only 300 miles on them. I agree with you if I go back to stock sizes I'll use the Dunlaps again. Last question were the Michelins front and rear the same compound i.e. did they have the same manufacturer recommended mark, like "*" for BMW or "MB" for Mercedes, etc.?

Originally Posted by XJsss

Not necessarily, take a look:
Michelin Pilot Super Sport Max Performance Summer
You want an unsurpassed blend of dry and wet street traction and handling and only the finest will do.
Max Performance SummerConsumer Rating

• Front: 265/35ZR20
  BMW
  Sidewall Style: Blackwall
  Serv. Desc: (99Y)Load Index 99 = 1709lbs (775kg) per tire
  Speed Rating "(Y)" = 186+mph (300kph)
  Load Range: XLMax Load = 1,709 lbs
  Max psi = 50 psi
  
  UTQG: Treadwear: 300
  Traction: AA
  Temperature: A
  300 AA A
• Price: $372.00 (each)
  Estimated Availability: In Stock
  Shipping Cost/Delivery Date
• Qty:
  012345678
• Tire Rack Road Hazard Protection Included ($29.20 value. Exclusions apply.)

• Rear: 295/30ZR20
  Mercedes
  Sidewall Style: Blackwall
  Serv. Desc: (101Y)Load Index 101 = 1819lbs (825kg) per tire
  Speed Rating "(Y)" = 186+mph (300kph)
  Load Range: XLMax Load = 1,819 lbs
  Max psi = 50 psi
  
  UTQG: Treadwear: 300
  Traction: AA
  Temperature: A
  300 AA A
• Price: $376.00 (each)
  Estimated Availability: In Stock

So looking at Michelin web site there are 3 versions of the 295/30ZR20s. The BMW spec has a 9/32 tread depth and the Mercedes spec has 10/32 tread depth, that alone will tell you they have different "personalities" and compounds.

Originally Posted by retriever-007

Thanks for this response. On my truck I first installed Michelin's in 2002 and have been extremely pleased with them in any weather situation. Also had them on my '91 Lincoln Mark VII Bill Blass Edition. On the '12 XJL-Porfolio the original tires (Pirellis) are doing ok but have not yet driven this automobile in rain or snow so don't know how they'll perform in those conditions. I once had Pirellis on my new 1973 Datsun 240Z (traded it for a new '76 Z car but wish I hadn't) but had a bad experience and got rid of them and said I would never again have Perillis on my car, but they came on the Jag when I got it in November. When it's time to change the Jag tires I was thinking about the Continentals, but first wanted to hear from someone who has used Michelins. I'll do some checking with my dealer about Michelins or Continentals for this automobile.