nope, we've had this in past season and they still under fuel the car, because on paper that's the quickest way to the finish line. that isnt going to change, even forcing them isnt going to help much as they'll just program the engines to burn it quickly at the start of race to dump the weight. you really would have to prescribe a lot of rules to get them to push like that.If they had more engines at no extra cost to the teams, they could fill the cars with more fuel to push more.