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I have numerous posts concerning my personal experience. My 2002 Q45 has a 4.5L/ w 360hp. THe rear ratio is 2.76. Stock tires were 245/45/18 on 18x7.5 fsctory alloy rims.
I run a 255/45/18. So i have effectively lowered the factory ratio with slightly taller tires.
I am 1825rpm at 63mph. I can get 27mpg all day long EPA is 16/22.
So it works for me. Plust the ecm for the transmission 'learns' how you drive and adjusts.
But with so much hp and torque idling along at 1825rpm is ok.
If you have access to some tires that are taller, that might be the way to also get what you want.
also, how much time are you on the freeway? for me its 60% so the deal works
Corevettes run 6speed tranny and 5 and 6 are a less than 1. Vettes get 28mpg on the freeway but the tight gearing accesses the torque as needed.
good luck!
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