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I mean there is quite a difference in BSFC between 1500rpm and 2500rpm on some cars, but I think with a CVT it's much less of a concern. When you drive stick, it's difficult to keep the load low enough at lower rpm to avoid enrichment and more importantly spark retard. Normally at 1500rpm the peak efficiency is something like -10% of peak overall, but you can easily make that drop much lower if your foot isn't very precise.
A CVT just bumps the revs up if you put your foot too far down and drops them if you are pressing too lightly.
On the FB25 and FA20DIT engines, compared to the FA20 you have a much lower compression ratio and TGVs, so I expect 1500rpm to have pretty good efficiency anyhow.
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