Ram towing mileage

Thanks in advance for the help
I don't have a truck, but If I had a truck, that I suspected was a gas-hog, and it wasn't the chassis;
>the first thing I'd do would be a compression test. and if she passed that;
>I'd put a scanner on it and see what the stinking computer is doing.
Yeah, you gotta be able to understand it, but the basics are pretty learnable, even at my age. (71)