Real HHO Success Stories: Before and After Fuel Economy Results

Case 1: 2014 Chevy Silverado 5.3L V8

System: Dual 6-plate dry cells, dual EFIE, 30A PWM. Before: 14.2 MPG (city/highway mix, measured over 6 tanks). After: 17.8 MPG (measured over 6 tanks). Improvement: 25.3%. Owner notes: "Took 3 weeks to tune the EFIE properly — LTFT settled at −13%. Night and day difference after tuning vs the first confused week when MPG only showed 5% gain."

Case 2: 2008 Cummins 6.7L Diesel F-350

System: 12-plate dry cell, 25A PWM, no EFIE (diesel). Before: 14.8 MPG. After: 18.4 MPG. Improvement: 24.3%. Owner notes: "Noticed EGT dropped by 110°F immediately. MPG improvement took 2–3 tanks to fully show. Easiest install I've done — no EFIE complication on the Cummins."

Case 3: 2011 Honda CR-V 2.4L i-VTEC

System: Single 6-plate cell, single EFIE. Before: 27.1 MPG. After: 30.9 MPG. Improvement: 14%. Owner notes: "Surprisingly clean install on the CR-V — plenty of room. EFIE tuning was straightforward with the ScanGauge live data."

Case 4: 2006 Kenworth T680 Semi-Truck

System: Dual 12-plate cells, dual 30A PWM. Before: 5.9 MPG. After: 7.1 MPG. Improvement: 20.3%. Driver notes: "At these fuel costs, 1.2 MPG improvement over 120,000 miles annually saves roughly $14,000. System paid back in 6 weeks."