We have had our 2014 ES300h for about 4 months. Coming up to 5,000 miles. So far, we are averaging about 37 mpg. If we are very careful with driving techniques we will occasionally average over 40 for a trip (we have achieved that for both highway and city trips)- but that is the exception. So far, no problems. We like the car and are pleased with performance. Too many bells and whistles for me, but that's the way it seems to be going.