Just the stock 3.55's

 

Ouch. Well, it won't be too bad with 33's.... but, you would like 4.10's better.

 

Oh I would, and so would my local gas station!!

 

Actually, it more than likely wouldn't hurt your gas mileage at all, larger tires/deeper gears would put your engine pretty much right back where it was with stock tires/gears.

Beat the crap out of your wallet though. Gear changes aren't cheap.