hello to all. I have a '87 c10 with a 5.3/4l60e swap. i am happy wiht my setup but not the tune. my vehicle has been tuned twice but im unsure if the tuner did his job. ive heard that 5.3/4l60e can get great gas milage at what expense(power/torque) my set up get me 15mpg city/highway. it is stock with 3.73 gears. any info would help. btw i want to tune it my self next time. thanks