You folks need to list your coverages. 'Full coverage' means you have comprehensive and collision coverage, but there're many different levels of coverage. Plus there're A LOT of other factors that affect rates within 'full coverage'. A $250 deductible vs $1,000 makes A BIG difference. And what really shoots up your full coverage is 'uninsured/underinsured motorists'. And next is medical payments, especially higher amounts (many levels of coverage too).
As an example, I was quoted $312 a year with the most basic full coverage (minimum levels of liability/property damage, and maximum deductible with comp/collision). And $785 with maximum levels of liability, minimum deductibles with comp/collision, uninsured/underinsured coverage, and highest medical coverage. Both are considered 'full coverage'. This is with Progressive, perfect rating (no tickets, accidents, perfect credit, etc), and multiple policies. I ended up with a $415 quote, with $100K/300/50 liability, $500comp+$1Kcollision, PIP, and disappearing deductible. As a comment, rates for the twice as expensive K1600GT were lower; go figure.
Bottom line is unless you're comparing the exact same coverages, you're comparing apples with oranges. Full coverage is the equivalent of higher-end V8 sports cars IMO... but you can still get a Corvette or a Ferrari. Same with full coverage. Have a great day folks.