Anyone have an idea of how much a typical towing package reduces highway gas mileage and adds to engine wear, when not towing anything? I'm talking about on a full sized truck or SUV with a V8. My thinking is that the lower final drive ratio revs the engine more, increases wear, increases noise, and lowers mileage on the highway. But maybe I have it wrong, I'm hardly an expert.
The motivation behind my question is that I'm looking at buying a new vehicle. The towing package is not an expensive option and even though I don't to tow anything right now, it might be worth having over the long run. But if it takes a noticeable toll on (the already terrible) mileage, and/or adds to engine wear, then I'll pass on the towing package.
Thanks for your advice.