It all depends what technology will be used by Lexus. There are sever ways to regulate fuel consumption. Now, a sports mode could electronically just shut down the 'economical' way of driving, use all the power in the battery (which will give sufficient amount of torque from baseline on) and all the power from a 1.8L engine. In this case, considering the 1.8L engine supporting economical driving in a hybrid situation, could generate an estimated 130HP max. Any more and the emission will go up too much. But this is an estimation. I base this on an interview I saw about 4 months ago about the prius.