Hey , I have a 2008 Chevy truck 5.3 L V8 1800 miles 15 MPG . I installed a 3 Jar wire HHO system with MAP enhancer .I have adjusted the bubbler to no bubbles and then to a few bubbles still no change in MPG.I installed a scan gauge that reads the MAP sensor ,at Idle it is 8.0 , with the enhancer i can control it from 8.0 down to 4.3 at idle I have the map sensor set at 5.0 at idle. also when I unplugged my MAP sensor the truck did not die it only idled down then back up, guess on newer trucks the added a bottom limit on the MAP program. My HHO system is only connected to the vacuum hose, I did not add the other hose to the air box (have a hard time explaining the hole at the dealership).My HHO system pulls 8 amps and are connected in parallel, I used distilled water and 1 teaspoon of baking soda ,I used 316 SS.032 wire 4 strands for positive 2 strands for negative 3/8 spacing. Wonder what I done wrong or not done to get a change in my MPG.