as i understand it from this page, the engines don’t actually matter, its your cars aerodynamics and vehicle weight. more weight = less efficiency for fuel, less speed. and towing is SUPER inefficient for aerodynamics (though admittedly i have no idea how that system works.)
also for refrence, a v12 diesel engine has about (and i googled this) 1900 hp. (though that particular engine says its used on a yacht, assumedly powering the turbine in the back.) v12 car engines about 600-700, going off luxury sportscars of the modern times.
most of the random cars in cata use inline-4 or V6, with V6 being about 300 hp