Interesting, but with all the Dyno Runs we've done here across the nation, we know the loss is about 20% on average. So Corolla 2zz-ge 141kw x 0.80 = 112kw Corolla 1zz-fe 100kw x 0.80 = 80kw Although it's true that some manufacturers will understate power figures for marketing reasons, I don't think it's the case here. Also, if the original 100kw figure was understated, when the engine was fitted with tighter emission controls lowering output, Toyota would still have advertised the car as 100kw, not 93kw, because the original figure was understated... But they didn't, meaning the original figure wasn't understated.