Consider the phrase "one of" as a synonym for "among". This way, your sentence reads: " Honda and Toyate are among the best selling cars in the US " I hope this clarifies this particular usage. As for the superlative nature, typically in English the meaning of superlative is slightly augmented by the use of determiners.
Your example already shows how to use "best" as an adverb. It is also a superlative, like "greatest", or "highest", so just as you would use it as an adjective to show that something is the ultimate example of it's kind when used as an adverb you do so to indicate that the adjective it precedes is to the highest degree possible. In your example "experienced" is the past tense of the verb to ...
A cozy cafe and bakery bringing seasonally inspired pastries, breads, sandwiches and a full menu of inventive Stumptown espresso drinks to the Beacon Hill neighborhood.
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