The easiest way is to switch between the barrels and the grinder bean explained. Just kill everyone with a gun and then run up to get the molotov guys.
As mentioned quite often now, that P2P button was mainly introduced to entertain the masses. I personally hate to watch a race with such a feature, since i prefer to watch overtake attempts that are based on skill and not just more power to go side to side on the straight.
In real life i can see why they did it, but on here i can not.
Judging from the stats of yours, you probably haven't driven much on the Oval.
Especially on oval tracks it is pointless to have such a button, since drafting has almost the same effect and gives players plenty of opportunities to overtake. Drafting is also more difficult and fun, than a simple P2P button.