I have heard the same argument but instead of detroit its the goverment that is keeping the high mpg's down to appeise the oil comapnies. This rumor has been traveling around since the 70's gas crunch..

It was a carbrator that got 100 mpgs and you could bolt it on any gas engine with the help of adapter plates...

04' # 5, W/leather & JBL omitted.
"Prius, Just ask the person that drives one"
04' Tundra, 18mpg city & 22mpg hwy.
04' Prius, 60mpg city & 53mpg hwy.

Kenstyle NHW20 AERO Kit