What is the author's tone in Vineland by Thomas Pynchon?

Pynchon's tone is informal, with the regular use of contractions and slang. His characters speak naturally, often with a "California" accent, and he reflects their pronunciation and inflection by using unconventional spelling and punctuation. "Really" is spelled "rilly," for example, and question marks appear at the end of sentences that are not questions to indicate a rising of the voice.