I am enjoying reading a book called _Winning the Oil Endgame_. I mention it here, because it includes discussion of present and future efficient vehicles. Here is a quote.
"The 2004 Prius is not only ~104% more efficient in ton-mpg than a modern non-hybrid; it also gets 38% more ton-mpg than the 1998 Prius. That six-year gain beats the average new U. S. light vehicle's gain over the last 26 years (1977-2003)."
The book is a PDF download at
http://www.oilendgame.org/
