I don't know if its something wrong with my car, the wider and taller Michelin's I put on it or what, but I cant get above 26 MPG. I drive 32 miles to work, 90% of it is highway, 70 mph. slight hills but nothing big. Car has 74K on it and when I had the Bridgestone runflats on it last summer when I first got the car, I was able to get 28.6 consistently with the occasional 32 mpg if i really worked the EV mode. Seems like the car hardly kicks into EV unless I am downhill and as soon as I press the accelerator pedal, the engine kicks on. Could my batteries be bad? I'm starting to regret putting these tires on if its what is causing the issue.
I am sure that it is not the tires. If you consistently drive 70 mph on the highway, you will very rarely have the car go into EV mode unless you are going downhill. If you have the cruise control on, it just won't go into EV mode at 70 mph. A lot of the trip back from Cherokee to Chattanooga is on two lane, winding roads, so I had to keep the speed down there. As I said, I was able to induce the car into EV mode a lot, and even on a straightaway, with the hybrid battery full, I was able to go around four miles - or more - in EV mode, even going 60 mph. Luckily, traffic was light, and I didn't slow anyone down behind me when I decided to keep the speed in the 50-55 mph range on a straightaway. If you want to experiment a little, try driving that course during a time when there is little traffic, and keep the speed at no higher than 60 mph. I would bet that the mileage will be close to 30, if not more, if you induce it into EV mode as much as possible.
To be accurate here, when I have done all the driving around my house, with trips of a mile or two or three, the mpg does suffer, because the car has to be warmed up to be in EV mode. One hundred percent local driving will give me mileage in the mid 20's.