christoper steiner offers his answers in the new book, $20 per gallon: how the inevitable rise in the price of gasoline will change our lives for the better." we followed him around chicago to profile his insights. "as we go from $4 a gallon to $6 a gallon to $8 dollars a gallon each one of those price points will bring a different change. and that's how $20 a gallon the book, is arranged." the world at $4 a gallon is easiest to recognize because well, we've already been there. and as steiner points out, those prices did bring real change. "well 2.97 is pretty close, but $4 changed a lot of things, people drove 100 billion less miles than they did the year before." that decrease was the largest drop ever and marked the first time in more than 30 years that americans actually drove less year over year. and while those who remember paying $4 bucks a gallon may find it hard to find the positive from such prices, steiner's research points to a bright side. "right now we lose over 40- thousand people each year to road crashes. well at 4 dollars, we're going to lose almost 10-thousand less