there is no benefit at all other than on most newer cars the cap is linked to the emissions system and you could get a check engine light due to it. I also like to moron attendants that don`t listen to your request. When I had my WRX impreza I told the moron to fill it with premium they put regular in my car instead. I noticed this, jumped out and proceded to get yelled at for touching the pump. When I yelled back at him that I said premium and not regular I got the dumd head tilted stare. I then pointed out the premium only sticker on the gas door. I then paid for the 2 dollar worth of regular and left him holding the nozzle and went to another station and got sunoco 94 for cheaper. Got to love the moron`s in this world.
Andrew
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