RC 2" level and tire size for 18s

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Hey guys, I tried using the search function to no avail.  Found ALOT of useful info, but not exactly what I was looking for. 

 

I have a 2017 Midnight with the stock 18s.  I put a RC 2 inch level on the front (Just the shock spacer on the lower arm)

 

Need new tires.  Anyone have sizes that will fit without issues.  Rubbing is fine IF I can BFH or slight trim.  

For those providing their own personal experiences, how was the gas mileage with the change?  Had a 12 5.3 that we put 32.8s on and it ****ing sucked dick im talking like 13 mpg.  I've noticed virtually no change with the leveling kit. 

 

I was thinking about just a 33 inchish tire to compliment the look.  I drive through the muddy fields quite often and use the truck as a truck.  I really enjoyed the Duratracs, but will branch off to other brands as well. 

 

Also, would it just be better to get new 20 inch rims? Is that why MPG sucks so bad with 18s, cuz your turning so much more tire?

 

 

Thanks all!