start up, gliding and other

noob question. everytime i start up and first start driving i cant glide at any speed. it goes from the ICE to regen, the SOC could be green, one off of green, half gone, 2 bars, it doesnt matter. my question is, is the battery wanting energy b/c i know the ICE is trying to heat up, but then why no glide when there is regen. is the EBH worth the start up 30 mpg. and is it better to take it easy on start up or use the 30 mpg to drive briskly?