Thank you for explaining the differences to me! My dealership could not. Are you saying that you run in Hybrid mode all the time? And that is the most efficient way to utilize the phev? I've seen in other forums that the battery should never be depleted to under 10%...
Let's be clear about a couple terms and operations.
The 4xe is
always a hybrid. Doesnt matter if you select the "electric", "hybrid", or "e-save" drive modes, they're all different flavors of hybrid functionality.
The state of charge for the battery in the display is not the actual battery state of charge. When it says "100%" in the dash, it's actually more like 95% full. When it says "<1%" in the dash, it's actually more like 15% full. It reduces the overall capacity to the usable capacity both for battery health (it isn't healthy foe the battery long term to ever charge to 100% or discharge to 0%) and to hold some reserve at the low end so that it can still behave like a "normal" hybrid.
Think of the battery read out not as the overall charge but how much excess charge is available for just electric use. When it says <1%, it's like it has that same small battery a normal hybrid has, it just isn't available for electric only use. Basically, you
can't ever make it go under 10%.
So if it's always a
hybrid, what's the difference between "electric" mode and "hybrid" mode? When there is charge in the battery, basically the difference is how hard you have to press the gas pedal before the gas engine turns on. In hybrid, it tries to use up the battery by not using the gas engine if possible (as the best way to not use much gas is to not use any gas), but it will do so if you try to accelerate harder to give you more instant access to power, etc. It's basically you telling the jeep "hey, I'd prefer to not use any gas, but use it if it would help."
In electric, it really tries to limit gas use, even if it compromises performance, but if you really put your foot down because you need to go now, it'll bring the engine on. It's basically you telling the jeep "hey, I REALLY don't want to use any gas, but if you absolutely have to, go for it".
With e-save, you have two different options. "Hold" and "charge". "Hold" is basically saying "I'd like to keep the excess charge level where it is now, so don't let it go down." It'll run primarily as a normal hybrid instead of electric only, but still may run electric here and there if it regens extra, you're going slow, etc. Usually this means using the electric motors to help a lot on acceleration, but keeping them off when you're at a steady speed. It's basically the exact same thing that happens when you use up the excess charge in hybrid or electric. It's just keeping the charge at "<1%" then instead of whatever value it was when you turned on e-save hold.
E-save charge is basically you saying "I want to have the ability to run electric only later, so I don't care how much money in gasoline you have to light on fire to make sure I have some later, go nuts". It's horribly inefficient to use the jeep in this manner (you will burn way more gas charging than you'd ever save with what you charge up), but sometimes you have reasons other than fuel economy why you might need it.
So what mode(s) do I use? Usually I use "electric" when I'm driving around town and e-save hold on the highway, if I know I will have enough in town driving when I get off the highway to deplete the battery. I do this because I'm trying to micromanage the behavior excessively and I like driving in Electric when I have the top open (which i usually open as soon ad im off the highway) so I don't have to listen to the engine. This is far from necessary though and leaving it in hybrid mode to make its own choices is totally fine. It'll use up the electric only range first and then act as a normal hybrid after that.
Yes, the fuel economy when acting as a normal hybrid is not great. Phevs in general trade off on economy this way because of all the extra weight of the battery system compared to normal hybrids. You get lower fuel economy on longer drives as a trade off for using no fuel on shorter drives. The 4xe is also designed to focus on off road performance first and economy as a lower priority. No one else does a phev system pumped through a real 4x4 drivetrain like the 4xe.