dina cappiello is national environment reporter for the a.p. and co-authored their report. let's put this change today in perspective. i think they wanted to take what, 3 billion goolons of et cetera nol out of the fuel mixture? is that a large amount? >> it's 3 billion gallons of all are unusual biofuels. for ethanol comrk makes the bulk of the biofuel mandate, it's about 1.5 billion gallons. what's significant is obviously this is an industry that wanted to see its portion grow. it was going to max out at about 15 billion gal nons a couple of years. what they did today was say 13 billion gallons for ethanol. last year, this year, this current year, it's 13.8. and it was a recognition that we're really reaching a point where as gasoline consumption comes down, there's really no place to put it unless you're going to increase the percentage of ethanol in gasoline. >> sreenivasan: and that could change how a car performs if it's past a certain percentage, right? >> some engines struggle with anything above 10%, which is what the vast majority of our fuel is blended with now.