I too have a V6 and went to the same tire size with no affect on power or MPGs. My Commander is my daily driver and I commute about 90 miles a day with 95% of that being on the highway so I wanted little to no affect on power or fuel economy. I do also go off-roading once in a while and it handles like a champ.
2008 Commander Limited 5.7L HEMI QDII
Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights
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