Magnussen finished ninth at Austin but was disqualified for exceeding the 105kg fuel limit by 170g.
Haas hoped race winner Kimi Raikkonen would lap Magnussen so he only had to complete 55 of the 56 laps.
‚ÄúYou get disappointed and frustrated because you‚Äôre angry at yourself, because you haven‚Äôt done enough with the rules, but you also get frustrated with the rules more than anything,‚ÄĚ said Magnussen.
‚ÄúBecause they‚Äôre stupid. And that should be changed.‚ÄĚ
Addressing the media ahead of this weekend‚Äôs Mexican Grand Prix, Magnussen referred to being forced to drive like a ‚Äúgrandmother‚ÄĚ on three occasions.
‚ÄúIn terms of losing points, it was only a P9, but it was points and we want to get all the points that we won,‚ÄĚ he said.
‚ÄúBut it was more in terms of being a passionate Formula 1 fan, it was very disappointing.
‚ÄúI‚Äôve fought my whole life to get into Formula 1, to be able to race against the best people, racing the fastest cars, at the top of motorsport.
‚ÄúThen you‚Äôre driving around like a grandma.‚ÄĚ
Esteban Ocon, Racing Point Force India VJM11 and Sergio Perez, Racing Point Force India VJM11
Photo by: Mark Sutton / Sutton Images
Magnussen said he noticed rivals Sergio Perez and Esteban Ocon must have been facing the same issue because ‚Äúwe weren‚Äôt racing, we were just cruising‚ÄĚ.
He claimed that ‚Äúthe race was finished already many laps before the end because we knew there‚Äôs no point‚ÄĚ.
‚ÄúYou do all this preparation, you go through a lot of work, you‚Äôre spending a lot of money and making a lot of effort to try and go fast,‚ÄĚ Magnussen said.
‚ÄúAnd then in the race you‚Äôre not allowed to use the fuel that you need to get to the end.
‚ÄúWhat is the point in that? It‚Äôs a bit wrong.‚ÄĚ
Magnussen had to resort to extreme measures to try to get back within the fuel limit.
Describing the situation in the US as ‚Äúthe worst that I‚Äôve ever had in Formula 1‚ÄĚ, Magnussen said he had no major problem with saving a small amount of fuel in a race.
He said his issue is ‚Äúhaving to go half throttle on the straight, when [on] the last lap you went full throttle, because we were in such big shit that we couldn‚Äôt even afford to go full throttle‚ÄĚ.
‚ÄúEven before that, we were trying very, very hard,‚ÄĚ he said. ‚ÄúAnd then by the last two laps or the last lap we realised, ‚ÄėShit, we are not going to make it‚Äô.‚ÄĚ
One solution Magnussen has identified with hindsight would have been to back right off and let Raikkonen catch him.
Sacrificing his race in that way would have at least secured one or two points and avoided disqualification, but he asked reporters:
‚ÄúIs that what we want to be doing?‚ÄĚ