HONDA CIVIC 1.350cc gasoline 1992 stabilized on a 30% savings!
TOYOTA HILUX 2.500cc diesel 2007 stabilized at 45% savings!
HONDA CIVIC 1991 – Highway driving stabilized at 38% savings, conservative driving stabilized at 58% savings… “Last week I was out of Athens 300kms away. Driving normally fast on my 20 year old Honda civic, the saves increased from 29% to 38%. On my way back I drove very economically and the saves grew to 58%!!!
DODGE CARAVAN: Increased the Mileage 30%
NEW CHEVY AVALANCHE: “Miles to the tank” increased from 380 to 485 – 27.6% Savings!
AUTOMATIC ISUZU 5.2 liter NPR 8 mpg to 11.5 -12 mpg, stabilized at 43-50% Savings!
MANUAL ISUZU 5.2 liter NPR, stabilized at 25% Savings!
Full Size CHEVY SCHOOL BUS 10.5 Average Mpg went to 13.5Mpg,stabilized at 28.5% Savings!
FORD F450 +6 Liter Ten Passenger Transit Van 6.65 Mpg stabilized at 9.22 Mpg,stabilized at 38.6% Savings!
DETROIT DIESEL 14 Liter Class A Tractor [Trailer] stabilized at 33% savings! Saved $10,000 the first three months.

Brazilian Testing of Model HDD 8.1L Diesel (Click here to see results)
Company monitored fuel test: 45 day period. Results in table below:
Mercedes – Tractor Trailer Model 3340 AXOR 6×4 – No Equipment 4150247 – Manufacturing Year 2006, with 321,465 km / rotated
Mercedes Goods – Model 2635 6×4 Tractor Trailer – 20 Production Year – No Equipment 3340173, with 274,872 km / rotated.

Home Fuel Savings Reports:
34% Gas Savings: “My monthly natural gas budget went from $205 to $135. That’s a $70 a month savings or over $800 a year. My wife can’t believe it.” PR, NY.
41% Gas Savings: “November’s gas bill was +$500 without Granfel Gas Optimizer; December was 27% colder but only cost $375. I saved $263 the first month and the savings continued the rest of the winter.” Dr. WM, NJ.
+30% Fuel Oil Savings: “I have been savings over 30% using Granfel Gas Optimizer on my furnace for years. I’ve saved thousands so far.” PK, PA.
Saved over 260 gallons of Oil the past two seasons: That’s over $500. BL, NY
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Business Fuel Savings Reports:
Saved 20% Cooking Costs: “Water on stove boils 20% faster; oven heats 20% quicker; saving a lot of money in gas.” CR, NC.
20% Gas Saved at Dominos and other Pizza locations.
Saved $100 in gas cooking costs the first month. Italian Restaurant, NC.