Supposed to be able to tow with the economy, atlas 40, or atlas 80 depending on how much you tow. I have only used the Hurcules(which is not recommended for towing) since I bought the programmer. I will probably switch to atlas 40 when I tow my 16k# fifth wheel, that is fully loaded. I did tow it empty with Hurcules and ID Extreme Street installed but that was only for a couple of miles to move it down the street. Bottom end response with PHP FICM programmer is way better than stock. My mpg have gone up also.