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285 is 11.2" wide and 305 is 12.01" wide.
I like a bit meatier tire so i run a 305 but either is good. I use to have Rubi take offs which are 255 or 10" wide and I didn't really lose much mpg maybe 1 or 2 so you won't notice much at all from a 285 to a 305. A 315 is actually 12.4" wide not 12.7"
Below is a tire size calculator.
http://www.tacomaworld.com/forum/tirecalc.php?tires=315-70r17-285-75r17
I like a bit meatier tire so i run a 305 but either is good. I use to have Rubi take offs which are 255 or 10" wide and I didn't really lose much mpg maybe 1 or 2 so you won't notice much at all from a 285 to a 305. A 315 is actually 12.4" wide not 12.7"
Below is a tire size calculator.
http://www.tacomaworld.com/forum/tirecalc.php?tires=315-70r17-285-75r17