HHO Generators for RVs and Motorhomes: Boosting MPG on Big Rigs

Why RVs Benefit Most from HHO

Motorhomes and large RVs are among the worst fuel economy vehicles on the road. A Class A motorhome with a gas V10 or diesel pushing 30,000+ lbs at 65 mph burns fuel at a staggering rate. Even a 15% improvement in MPG translates to significant dollar savings over a 3,000-mile road trip.

Engine Size Considerations

Most Class A motorhomes use either a gasoline V10 (6.8L Ford Triton) or a Cummins/CAT diesel. These large engines need substantial HHO output:

• Gas V10: Target 2.5–4.0 LPM — use dual 9-plate cells in parallel
• Diesel (8.3L–12.0L): Target 3.0–5.0 LPM — use dual 12-plate cells

Electrical Considerations

Large diesels typically run 12V or 24V systems with high-output alternators (150–200A). HHO cells drawing 25–40A total are a modest load percentage. Gas V10 motorhomes have 12V systems with 130A alternators — 20–30A HHO draw is manageable.

Expected Savings

RV owners report consistent gains of 1–2 MPG from well-tuned HHO systems. On a V10 averaging 8 MPG, reaching 9–10 MPG represents a 12–25% improvement. At $3.50/gallon over a 10,000-mile season, that's $400–$875 saved annually — enough to pay for the HHO system in one season.

Installation Tips for RVs

Mount cells in the engine compartment or a vented storage bay. RVs have more available mounting space than cars, making installation easier. Use a large-capacity reservoir (2–3 liters) to reduce refill frequency on long trips.