i use ECO mode most of the time, after a couple of months of experimenting, the sweet spot for getting the best fuel economy is with the following conditions:
- typical hybrid driving style (slow down early, avoid hard braking and accelerating)
- A/C off during the first 10-15 mins of starting the car (i roll down the windows in this case, except when i enter the highway)
- being able to drive at around 40-60mph smoothly with as little stops (stop signs, red lights) or slowdowns (traffic jams) as possible
- being able to (while driving) keep your ECO meter needle just above half way, above O of the word ECO on the meter, or around the 930 to 10 o'clock position. i find that if you go over 10 oclock you start to lose fuel economy. if you keep using EV mode and keep it at 8-9 oclock, the battery will drain very fast and you are not going fast enough to make it worthwhile (and eventually the battery will be drained and you are stuck with gas-only for a bit until the battery is able to hold a bit or charge to sustain EV mode again). keeping the needle at around the 930-10 o'clock position (just above half way) seem to strike the best balance between using the least amount of gas, while being able to charge the battery decently, while being able to travel at a decent speed. if you need to accelerate such as going up a hill, then by all means press the gas and have it meter go up to POWER; just dont leave it there for too long.
for a while i was able to achieve 50mpg this way.....but are you guys basing your mpg off the (skewed and inaccurate) dashboard mpg reading, or actual real fuelly-style mpg? because my (canadian) car for some reason displays in UK mpg as supposed to US mpg on the dashboard, which has a higher number than the US mpg.