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actually I get good traction with brand new Federal 595SS. Run them at 28-30 psi hot. But yah RT615 and 595 RS is very comparible. I think it pretty much comes down to sizes.
When I was running RT-615 205/50/15, that City Tire Online was so nice to sell us always at a great price, on our 24 hours of lemons car, I didn't have any hint of greasyness and I was on my second stint ~3hr of the day 10 hr's total. But then again it was a stripped out FB with 115 wopping horsepower
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