New Galant VR4 owner, ST Helens

[Steve case]

Hi Guys

I have bought a Galant VR4 a couple of months ago UK version. I will post some pics. Love the car but I am having a few issues the AYC red light comes on after about 30sec of driving the green lights do work on the first corner if your quick before the red light. The ABS light is on but this is my fault caught a wire when installing the power cable for my amp so I know what the problem is here. But my main concern is the fuel consumption around 10mpg seems worse on the motorway at 80mph really eats the fuel. I will point out it has been decatted by the previous owner but apart from this seems standard. I have fitted a K and N filter and had a cat back exhaust. Any advice/ help greatly appreciated.

Thanks
Steve