mmm, got to disagree with many of the comments here, first, +2mm means +20 cc, not 1-2 cc... but most of your gain will come from the increased compression which in thermodynamics terms, means better efficiency, i.e. getting more power form the same amount of fuel. it's a big subject, do some reading on thermodynamics of internal combustion engines.
the improved motor response with higher compression starts already from low revs and you will certainly notice it. the main reason high comps can run hot is because people often install these pistons without checking squish height. this is hugely important to avoid detonation which overheats the engine. bring squish down to around 1mm, not more and youll be pretty safe. agree that this doable only if you can get decent gas, not a good idea if you are planning to go to remote places.
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