would bigger tires effect my gas mileage and power?

2010 2.7 4x4 5 speed i currently have factory 245 75 16 i would like to put bigger tires would it effect gas mileage and power? here a pic of my truck let me know what else i could add to the trucks thanks

 

Yes

 

Yes.

I put 31's on my '94 and it was the biggest mistake I ever made with that truck.
I would have been better off tying a boat anchor to the bumper.

 

that what i'm thinking just buying the factory tire size again oh well.

 

Affect

And yes.

Matt

 

Yes the bigger the tire the more power it takes to spin the wheel. If you want bigger tires be prepared to regear and supercharge,

 

yes

 

I might go wider with mine, but I'll be keeping the diameter within 3%

 

I've definitely noticed bit reduced power, but I drive like an old lady anyway. Whenever I DO need to get up and go quickly, it'll still scoot.