My MPG seems to be down on my Ram. I've looked over and fixed a couple of exhaust leaks. Right now I'm thinking I might need to replace my oxygen sensors, since I've got 122k on the odometer. I've read you should use NTK or OEM sensors. What about an NTK universal? It's significantly cheaper than the vehicle specific one with the clip. Soldering it doesn't bother me. Anyone use these?