Will slightly taller tires alter my mpg?

[TwoFiftyShifter]

So since I got a tach and GPS in my truck, I've been checking the mpg alot, and at 60mph 2200-2300 tpm on highway I'm getting 14.5 mpg. City is 10-12. I currently have 245/75/16 tires on there, and I want something just a little taller, and was thinking of 235/85/16. They seem to be an inch taller, and would look a little better. This change is too small to negatively affect my mileage, right? I have a 87 V20 350TBI, 3.42 and a 4 speed.