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.
Notably, it's also bad for your pocketbook to book too far in advance, according to CheapAir. People who booked 210 days before the flight ended up paying an average of $475 for a domestic ticket. There are exceptions and caveats, however. If you're booking for a high-traffic time, like Thanksgiving, it can make sense to book well in advance. The optimal time to buy a flight for Thanksgiving weekend in 2012, for instance, was 96 days in advance.