Auto insurance is obviously different depending on the type of coverage you buy, but since the national average expenditure for car insurance is $795 a year and PA's average is $820, it can easily be inferred that Pennsylvanians are likely to pay a bit more on average for just about any type of coverage.
To answer that question, airfare shopping engine CheapAir.com monitored fares for more than 4 million flights in 2013 over a booking period ranging from 320 days in advance to one day in advance. Its researchers found that fares for domestic flights were lowest 54 days in advance.
For international flights, you'll want to purchase tickets even farther in advance. Travelers going to Africa should book the earliest, at 166 days in advance, while those heading to the South Pacific can book much closer to their departure, at an average of 70 days in advance.