Again,
ditto what bruce said.
The name of the the game is reduced rpms at cruise.
Since you have made it clear that you have no interest in increasing the tire size by 5% (and your comment about lift kits reflects your lack of even reading posts on the topic) not sure why we should try to recommend things that will have little or no measureable effect.
Why don't you let us know where your at on the 65 item check list.
Let us know what you typical week drive is like.
How much time you spend REALLY driving 55.
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