I'm 25, clean record, in Ohio, and pay Geico $960 a year for my 02 turbo and 04 G35 Coupe with full, max liability coverage but a $1k deductible on both (no BS tow services). I told them I'll drive each about 6k miles a year. I talked to three other insurance companies and they wanted $1850 to $1950 to insure me for my two cars, so in my case, calling Geico saved not 15% but about 50% .

BTW, GEICO seems to list 996tt's as GT2's. Don't let this bother you, take the lovely rate and enjoy!

O ya, I also use Geico for renters insurance, and I think this dropped my yearly rates by $100 or so for bundling.