every time unfortunately
What about the other fuel efficiency features that are effectuated in the eco mode including but not limited to less a/c? Try switching form the eco mode to the sport mode while the a/c is on. The fan immediately goes into a higher speed and the air coming out of the vents gets quite a bit cooler. I have to think the engineers at Toyota are not all dolts, so if they claim that there is more fuel efficiency in eco mode, I have to take their word over the anecdotal postings on here, but again, it's your car, do whatever you want. I often drive in sport mode, I like the feel of the car.The kinetic energy of the car at rest is zero.
At any given velocity v, the kinetic energy = 1/2 * mass * (v)2
The energy to move the car from zero to v comes from the petrol and/ or battery. If a car travels from A to B at an average of v mph, the acceleration to get from zero to v can vary widely without making much difference to overall fuel consumption.
I'm not surprised the fuel efficiency is similar for all three modes. Sport is more likely to reduce efficiency through a higher probability of increased braking, but this is mitigated to some extent by that braking charging the battery.
[/I][I said:Immerstark;1654916]I spend almost all my time in eco mode and get 50mpg at the pump. I find it much easier to ev glide with the weakened throttle response. Most of the people I see claiming better fuel economy from sport mode are getting 37-39mpg, which leads me to believe they aren't driving the car like a hybrid. So perhaps which mode is best for you depends on your driving style.
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