How much does my driving affect the trend bar? I swear I can be driving the same route to or from work and at times the bar goes down/yellow, or it may go up/green. I assume "green" is good but can't figure out exactly what affects it. Generally, the only way I can make the yellow bar go away is coming to a complete stop. I guess I'm still stuck on the efficiency bar from my previous Honda Civic Hybrid where the rating was directly affected by my acceleration/deceleration. That is certainly not the case in my Bolt.