chip or dont chip

I have a 2012 tundra and just put 275/70's on it and man she looks good, but now is a lot more thirsty. So I have been doing some research on chips or programmers and CIA's and seem to get mixed information. On the chips say its worth it, some say its a scam, some say it wont churt the truck, and some say it will.

So I was wondering who has chipped with out mechanical issues and who has chipped and have had mechanical issues.
Which is the best chip I have looked at the bully dog GT programmer, the unchip and the Innovative Performance chip. The unchip and Innovative chip both claim to boost MPG up by 5 and HP up as much as 35 and wont leave a foot print. other words you can unplug it and nothing is changed in computer.
Most of the people that I have talked in person say they have used the Innovative in their track cars.

 

Ehh nah. Like Sean said, worthless investment. I jumped up from 255/65 P tire to 275/70 LT and it dropped 1 or 2 mpg.

Honestly though, you didn't buy a truck for its mpg. If you wanted good mpg, there are some nice Prius selections out there.
Good thing about tundras are they're so reliable. The less nbr of shop visits and headaches more than make up for the mpg. Had a Silverado and the mpg is the same. My cousins f150 gets the same as I do. You're fine, don't sweat it and keep on trucking.

 

+5 MPG and +35 HP.....ummm not.

My guess is you didn't actually lose that much MPG. Rather your speedometer is now no longer as accurate. About the only way to verify it is to fill up, drive a known distance, and then fill up again. Either that or install the Hypertech speedometer calibration module.

 

See that's the wierd thing about my tundra. I checked on the gps before I changed tires and I was always 1 or 2 miles under what was showing on my speedo, but as soon as I upsized, it was spot on. The OP has exactly the same truck I have, I don't think he'd need the hypertech.
I think they put those size tires on stock to make it seem like good mpg, when in reality, it's actually lower.

 

Those sneaky bastards

 

Smart though - from a business point of view that is

 

After I upsized my tires from 255/70 to 275/70, I checked my speedometer with my Garmin GPS and the speed is dead nuts on.

What are yalls take on CAI's? I know the tundras come stock with one but is it the best option?