"Know Before You Owe" --an auto loan initiative by the Consumer Financial Protection Bureau, including an "auto loan shopping sheet," may be found at http://www.consumerfinance.gov/consumer-tools/auto-loans/
This information may help consumers:
(a) understand the total cost of the loan (not just the monthly payment),
(b) comparison shop, and
(c) avoid costly surprises from optional "add-ons"