Real hybrids (think Prius) are only a few % of the market — so, say, each of the 2-3% or so saves 40% on gas. Now how does that compare to 100% of your models saving 2-10% on gas because you have the more economical engine combined with a BAS system? In the end, you get more total savings, because a lot of people can (or will) afford only less expensive vehicles, when they can make a new car purchase at atll (think high school and college grads).

As long as ICEs are going to be around, in both hybrid and non-hybrids — and it will be a while — start with the engine and go from there. The trendy/spendy crowd that drools over a new wild hybrid is going to be paying more than I have paid for all of the(used) cars that I have ever owned put together in my 30 years of car ownership.