Interesting. Iv'e only got about 5500 miles on mine since putting them on at the start of February, but I'm not seeing a significant difference in MPG from the RT43s - so far all my tanks have been in the 41-43 range (an ALH+01M doing 90% highway in somewhat-less-than-flat NJ), not counting one low tank recently caused by lots of idling to track down that coolant leak I mentioned over in the MKIV forum). Considering that over the about 78,500 miles I ran the RT43s I averaged 42mpg (with the highest being 45.46mpg), the small pile of data thus far on the RT45s is putting them about dead even (statistically speaking) in MPG for me.
Oh, and that's with running the RT45s at 35PSI vs the 38-39 I had the RT43s set to.
Agree the RT45s are fine in the rain, but I think they're quiet (though I've never run Michelins). Looking forward to seeing how they do in snow next winter, provided NJ
Buy Second Hand Tyres in Hayes...
That kind of mileage per year is going to kill most tires in just over 2 years, I'm going slightly longer, but I'm only doing about 25-26K per year.