Wheel Offset with 1.75” fender flares

I have the bully dog bdx tuner set to performance mode. I daily drive my truck so I expected the mileage to go down substantially after lifting more with 35s but it barely moved, I do get primarily high way mileage though

 

Ok, that’s great information... thank you for your help... now I should be able to get a better idea of what I need to do, so I forgot to ask.. did you do any plastic trimming? Or metal? And if you did how much it was, minor or mayor?

 

I only removed the rear mud flap, I have an after market bumper so plenty of front clearance

 

Ok guys, thank you very much for your support and help in getting me through this process here it is the pictures of my ride

 

First timer here down loading pics... I think nobody noticed...!!! Lol.!!

 

I end up with
305/55R20
Vapors 20x9 +1 offset
3+2 leveling kit
And minor metal trimming

 

Do you have a pic of your setup? I have a 17 with fuel 20’s and fender flares, and I want to step down to 18” wheels but still maintain width with the flares

 

0 offset

 

Mine are the silver tundra above... I have 3+1 leveling kit, 33” tires ridge wrappers on 20” wheels... and a +1 off set... my flares stick out 1.75” from the body of the truck