I need some help. I have a 02 taco (4 cyl) with about 124k miles. When I bought it, I could've sworn I was getting 25 mpg but shortly after, I added a front brush guard, side steps and a rear hitch and now I can't seem to get anything better than 20 mpg (all freeway). Does this seem normal? Could the weight of the things I've added really cause that dramatic difference?