Hide your cats!
hey guys! i need some help/info on how to tune up my dads 93 dully. its all stock with under 300,000 miles. with the numbers i put together, i hand calculated hes getting about 13.3mpg and getting about 200 miles pr 1/2 tank. i dont know these older motors like the 3rd gens but know that some people are getting upwards to 20mpg. thanks in advanced.