I am new to the 80 side, so please excuse my ignorance. My 83k mile LX450 is ridiculously slow. I understand they are not speed demons but i need to try to get this engine to perform as good as possible. I read somewhere here an outfit cleans and conditions my existing fuel injectors but cant find a link....anyboby have any experience with performance and mpg gain? I get approximately 325 per tank, half highway, half town.