Welcome to the group! I just started my second year with the car. I am no expert on this car but these are my observations and experiences. I don't think keeping the rpm's up will do any good. Overall, light throttle is what keeps you in ev mode and pretty much anytime the ev light is off, you are creating a charge. Sometimes on the highway I will switch to sport mode until the battery fully charges, then switch to eco. The car does seem to have a little more electric torque when the battery is over 3/4 but overall it doesn't increase mpg. I think light braking works best for regen braking. Even coasting will provide regen braking but I try to watch the power gauge as I brake and keep from comlletely burying the gauge with the idea that when the gauge is buried, that is when the wheel brakes kick in. I can easily get 50+mpg around town if I feather the gas and stay below 50 mpg. I am no hard core hyper miler, but I just enjoy driving for the high number. I estimate I am close to 38 mpg over 16,000 miles and have never gotten less than 34 mpg on a tank of gas, even in the winter. I think I could do even better if I was the only one driving the car, but my wife has a lead foot.