Originally Posted by Zeeper
also winter fuel blends, usually 10% ethanol, which returns fewer mpg's. So the same exact drive in the summer could be return another 2-3 mpg.
You're probably right about 2-3 mpg.
Unfortunately for CVT owners (which leaves you out) 2-3 mpg just isn't going to do it, if one knows how well other 36 mpg highway EPA cars do. Here's the evidence (called data
for you Zeeper) that the Impreza CVT should be rated at no more than 32 mpg highway: