I finially had my Primacy MXV4 's installed yesterday and had to travel about 150 miles. Car seems to handle well. It is certainly quieter from the tire noise. It seems to have removed the high speed "wabble" on interstates following trucks. I was running 42/40 on the Goodyear tires but had to reduce the air back to 37 /35 due to the wabble. With this in mind, I feel I will get as least as good gas mileage. BTW, my Michelin rep recommend the Primacy over there Energy saying it was an improvement. The Greenville SC Goodyear folks stated their TTT tries are not sold in this area. I don't understand but all is well.
The Primacy MXV4 is the new replacement for the Energy. The rubber composition is longer wearing and has a warranty. The Energy has a softer composition and does not carry a mileage warranty.
My primacy MXV4 tires now have approx 30K in them and show very lillle wear. I rotate at 5K using the Michelin method of cross in the two front to the rear and moving the rear straight to the front. I am sure this is better than the Toyota method of straight back to front. I can't say I get any better mileage but I like them much better all round.
