Highway gas mileage decreased from 40 to 33 on long trip. May partially be due to cold weather. This problem occurred 2000 miles after the dealer did the 100,000 mile service. I have never gotten less than 40 MPG on long trips. The dealer who services this car has mechanics who are not very knowledgeable about the hybrid drive, and I had to remind them of every item listed for the 100,000 checkup.

Sticker stated I should be getting almost twice what I'm presently getting. Used premium gas which improved a little but not much.

when I purchased the gas it was getting 52 miles to the gallon it has decreased in the past two years to 41 miles. The dealer said upgrade the gas which I did and it hasn't made any difference.