I think the gas mileage for the SI and Hybrid is Road/Highway 23/32(SI) and 49/51(Hybrid)But rememer the SI only comes in a stick shift I think.Whilst hybrid comes in Stick or Auto models.So you can either pick the sports, 0-60 in around 8 seconds I think. or the hybrid that does 0-60 in around 11/13 seconds.They are two different type of cars in terms of choice.. you going to save on fuel? or you want to have a faster car... thats the choice really.The hybrid almost goes twice as far on one gallon of fuel.. Choices choices....