© 2012 Marine Development & Research • 973-
Pros and Cons of 10% Ethanol in Gas
If not already, you will soon be using 10% Ethanol as a replacement oxygenation additive
for the discontinued MTBE (methyl tertiary-
Ethanol attracts more water than plain gasoline.
Ethanol contains only about 2/3 as much energy as plain gas, therefore getting poorer mileage (approx. 3%) for the same volume of gasoline.
It only takes about 3/10 of 1 percent of water (.3%) to begin separating the water and 75+% of the Ethanol from the fuel, which then drops to the bottom of the tank with the water. There it forms what is known as a “single phase separation” layer of water and Ethanol under the gasoline. This small amount of water equates to slightly under 4 oz of water per 10 gals of gasoline.
When the water/Ethanol layer at the bottom of the tank rises to the level of the fuel pickup, it will be sucked up into the engine, shutting the engine down. The water/Ethanol layer WILL NOT support combustion.
MDR’s Water Probe Indicator (MDR-
Tests have shown that MDR’s NEWEST PRODUCT, E-
A simple field test will prove how well E-
• A clean, clear quart-
1. Add approximately 10 oz of E-
2. Add two (2) capfuls of water to the jar using the E-
3. Add two (2) capfuls of E-
needs more to complete the emulsification process.
4. Adding another ½-
Should the fuel stay cloudy, an additional ½-
Winterizing and Prolonged Storage of E-
Any vented fuel tank containing E-
1. Try to determine if there is any standing water/ethanol on the bottom of the tank.
Check fuel filters, water/ separators, or use MDR’s Water Probe Indicator (MDR-
2. If no water is indicated, E-
3. Now add MDR’s Gas Stor-
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