The difference in the average tariffs between the US and the EU
Not qualified to provide an opinion on this, but I can definitely provide an opinion from the Russian/Chinese side.
The EU does not play fair.
Russian or Ukrainian wheat, corn, soy, rapeseed, etc - harsh quotas. You sell a million tons - you can't sell anymore for the rest of the year. Go and sell it to Africans or Asians.
That's regarding quotas. They apply to nearly everything. Russian steel. Russian coal. Russian aluminum.
That's worse than a tariff - and is naked protectionism. You know we would kill your agriculture and your steelmaking in an instant with our cheap energy, cheap labor, and massive size.
The worst thing - however - is not even quotas. It's the ever evolving technical standards.
You started making cars in Russia, including the engines, and you're doing well - now you want to export to Europe. Your engines are compliant with Euro 4 emission standards, and with everything else. What does the EU do? It releases new guidelines - now for Euro 5 emission standards. Guess what - nobody can comply with these except for European manufacturers. By the time you catch up - they'll say Euro 6 is now the new requirement.
Then there's the ever evolving requirements on humans rights (was it made in Xinjiang using Uygur labor?) There are then carbon offsets - did you buy our stupid EU carbon credits to offset the impact of all the trees you cut down (these carbon credits erase our competitive advantage, and make it uneconomical to sell to Europe).
They couch everything in things you cannot really argue against without looking like an assh0le. Who is pro-slavery? Who is pro-ruining the atmosphere? Who is against reducing landfill waste, and against recycling? But the end result is that they don't let you into their market.
Tariffs are only a small part of the story.
In food you have European standards of Organic that far exceed the US requirement for "Certified Organic". This means - US organic food is too unhealthy to enter the European market. American chickens? They are not allowed into Europe because they are bathed in chlorine. US software - frowned upon because it doesn't protect user privacy.
The EU knows exactly what it's doing - and its protectionism.