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The hesitation I think you commented on sounds like a clogged EGR valve. I have found that a radiator partial block both helps warmup and aero, but be careful without a temp gauge. Definitely inflate the tires as much as you feel safe. As for what speeds are attainable in lean burn, it will help you reach higher speeds if you forget about accelerating in lean burn. Accelerate to 3 or 4 mph over the speed you want, then back off until get into lean burn. It can't easily get to 55 in lean burn, but it is not that hard to maintain 55 there. 65 is a little tougher, but doable more often than not.
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