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Weight, especially in the tires, only really matters for stop-and-go driving (or on REALLY rough roads, but on roads that rough I'd worry more about flat protection and grip than efficiency). For cruising, once you're up to speed 20 pounds doesn't make much difference considering the total weight of the vehicle (especially if it's a modern pickup/SUV).
Smooth hubcaps can make quite a big difference at highway speeds though. I recall seeing a thread on here of a pickup gaining a few percent from those alone. I recommend sticking with the steel rims if they can take hubcaps, and making or buying some smooth hubcaps for yourself. Lighter rims can actively hurt aero as, from what I've seen, they tend to have more open spoke patterns that catch more air.
And LRR tires are, unfortunately, fairly ambiguous as to what their improvement is, as CapriRacer mentioned; there's no standardized measurement. If you need new tires anyway it probably wouldn't hurt to go with LRR's, but ditching a new set of tires to get them will probably more than negate your savings from the LRR's.
As long as you have extra space in the wheel wells, picking tires with a larger outer diameter will also generally help fuel economy, all else (like tread pattern and tread width) equal. Narrower tread width also helps, though there you can get into the issue of less traction.
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