So, I have an issue hat I can't resolve on my own. I did an A136 on my RTS back in Aug./ Sept. Everything went really well except I couldn't reach the trans. fill bolt. Short stubby arms. In Oct. I had new tires and new struts installed all the way around. Since then my mileage has dropped pretty significantly. I was proud to brag that I was averaging 18 mpg in the city and 22-23 on highway. Now my city average is 16 and highway is 15.1( these numbers are not reversed). I keep very careful records of fuel consumption. I had my repair shop look at everything and they say it's fine. Took it into Honda and everything is within specs. Honda suggested to change plugs which I have done and has resulted in no changes,( spark plug gapped at 1.0mm-1.1mm, verified by Honda Tech.). I am very aware of the winter fuel as I live in the Chicago area, but have never experienced this so badly. I do not use cheap fuels, as I am aware from working on cars, not professionally, cheaper is not always better for the engine. I faithfully run heet in the tank and injector cleaner in the system at every oil change. I have all amsoil products in the car with the exception of the rear diff. VTM-4. Xfer case is running amsoil 80-90 and trans is running amsoil atf. I informed this to Honda tech. and he said that amsoil lubes were perfectly well within reason to use in Hondas. I did all this in Aug./Sept. and it made no difference. Got great mileage after changing these fluids. I thought maybe after the struts were replaced that the brakes were adjusted too tight, but they say the brakes are fine. I will say that I do from time to time feel like the engine is bound up so to say. I can hear the difference. Truck has jut over 73000 on it. Any thoughts?