So 2017 gmc elevation. 5.3 4x4 DOD delete before I put wheels and tires I was getting around 22-19 mpg WITH deleted DOD. Now have 305/55/20 nitto’s AT Now getting 20-17 mpg. Ride did get stiff but not as bad as my 96 z71 with 35/12.5/15. Anybody else getting the same with the DOD delete