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Thoughts on K24 vs K20 fuel economy potential?
K24 is basically a stroked K20 - both have (approximately) the same cylinder bore. The K24 produces around 20% more torque, almost exactly the amount you'd expect based on the considerably longer stroke and correspondingly higher displacement.
All else being equal, I'd expect a motor with a longer stroke to provide better fuel economy (e.g. 2.0L vs 2.0L) due to better cylinder geometry. However, the K24 has more displacement. As long as I'm not needing to downshift when cruising, I expect that would work against me. A K20 will be running at higher load in the same gear, but its peak efficiency will also probably be at a higher RPM.
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