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My experience has been that, with non direct injection + OTTO cycle engines I've driven, short shifting and staying at higher load has generally given the best results. For example, in my Insight, shifting so I'd land at 1000-1250rpm in the next gear generally delivered the best fuel economy, whether it was with the 1.0L or the 2.4L I later put in.
With Atkinson cycle + direct injection engines, staying a bit away from 100% load seems to make a difference. At low RPM and high load, it drops more deeply into pulled ignition timing and fuel enrichment, making mid-RPM (2250-3250) mid-load more economical. There are instances where it's even more economical to cruise in a lower gear.
It might be enlightening to see what Hyundai's fuel and spark maps are doing.
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