Could someone help me? I read somewhere about a company that has developed a battery that you can attach to your hybrid vehicle that will charge your battery pack to capacity. They said that you could get maybe 100 mpg because your gas engine does not have to run at start up to charge the battery while the car is warming up.. That at this point it will be running around 9 grand. Does this ring a bell in anyone’s memory. I told my husband about it and now can’t find the article. Any help would be greatly appreciated