Hi, I noticed that my mileage is better in slow traffic compared to high speed driving. This is with a full charge. I have a round trip commute that is at the limits of EV range so I noticed that if I'm driving at highway speeds, the ICE needs to assist to get me to my destination. Someone said to me that this is due to the regenerative braking but I don't feel that is correct. I understand that regen braking will recapture some of the energy used to propel the car but you can't recapture all the energy used or gain energy with regen. If you could recapture all the energy, you would be driving like a crazy person and race forward and stop. I did a search and autotrader claims it is regen braking. So what is the real reason slow speed mileage is better than high speed mileage? I say it is because of high speed drag. The air acts as a greater force at higher speeds. I'm not comparing a hybrid car to a regular ICE car.