It helps if u have the bee shield equipped while you're trying to farm him. The shields extra attack carries over to your attacks from the car and theres no shield to deplete so you get the extra bonus with every shot. --- On behalf of all Americans, I would just like to apologize to everyone for rap music.
Yeah I have a bee. Didn't realize the shield transfered over to the car. I'll try that. Thanks!
Don't forget the Trespasser sniper rifle, equip that and choose it as your current weapon before you climb into the car.
The Trespasser ignores shields and does damage directly to the health bar, and that ability is transferred to the machineguns of the car.
Also don't forget that you can actually jump the car up onto the mountain and sit it right next to Doc Mercy's lair. With the Trespasser + Bee combo you can kill him in one or two fights before he walks out of range into the cave.
Or you could get lucky like I did last night and get an infinity from the red chest above the Hyperion Info Stockade after killing Saturn, it was non-elemental unfortunately. . --- What's the purpose in owning a Grenade Launcher? The sheer inability to continue life without it ! ! !