I have an 09 wrangler and was wondering if I can do anything to my jeep to help out with gas? Like exhaust, headers and intake I'm trying to see if it's worth upgrading or not. Cause I drove bout 100 miles and I'm on a half tank. It don't seem right to me cause I get like 200 miles on a full tank. Please help me out with this one or am I just screwed.