I Love the LML for what it is. I pull my 22 foot boat all the time and have no problems. pulling at 65-70 mph I can get 15 i dont know about any slower i have tried to tow it at the california 55 mph but get bored and speed up. empty if i behave I have seen 20-21 flat ground of course. but not stock. Stock It was pretty good till the regen would kick in then would see like 12 mpg