All this is checked on Honda workshop, I have also changed the piston rings, head gasket
includes surface grinding ,valve grinding and adjustment , VTEC check , changed trotlesensor, clean airsensor , changed spark plugs , thermostat
, check ECU, filters ......
I live in Thailand here is at times very hot, I notice that if the outside temperature is below 30 C are things almost normal , between 30 and 35 C , there is less power , over 35 C , it is difficult to drive over 100km / h , and the car gets too hot, Temp go down fast if less trottle. If I use owerdrive can not keep a higher speed than 80km / h without a downshift, If I'm driving on the freeway with owerdrive disabled and over 5800 rpm so that VTEC is active , it seems the car acting normally, temperature normal and enough power. The car also drive on LPG, all just same if use LPG or gasoline.