If I recall right, the XFE had significantly better aerodynamics and longer gearing. That would account for a lot of the highway gain.
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The K24 engines would not see any gain from pulse plugs simply because they're not tuned for them... but it might make them idle better on poor quality low-octane E10 gas.
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Trivially, the CR-V K24 has both more aggressive low-rpm cam lobes and less aggressive high-rpm cam lobes. This gives it better low-end performance to cope with the extra weight (both car and cargo) over other applications in the range. I've been wondering about swapping in TSX cams, for better economy down low and much better "kick" up high, but apparently the systems are not fully compatible due to the lack of VTEC on the exhaust side.
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