swng, i think the data you cited disproves your point. the yaris average from actual drivers is 35.1, while the avg for actual corolla drivers is 31.2, so the yaris is a 12.5% increase over the corolla based on that. looking at the chart from actual yaris drivers, many of the very highest mpg figures come from tanks that were primarily highway. my tanks (5 speed yaris) have been more highway than city lately, and im getting 4-5 mpg's more than i ever achieved with my 5 speed corolla over the same routes.