Hey guys...got a question for ya. On a road trip, and my check engine light came on and I started getting really bad gas mileage. I just figured it was bad gas and didn't think much of it but now I notice that my eco light isn't coming on either. If it was a bad tank of gas it should be gone now because that was three tanks ago. And my check engine light is still on. I'm getting between 15 and 16 mpg and I have gotten between 19 and 20 every other time on the highway. The truck runs fine and all the gauges are normal except for check engine and eco. Any ideas? Thanks.