Quote:
Originally Posted by ngabdala
Too much risk with unleaded and you are going to have to use more gas just to get your car to move.
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It's perfectly fine to run regular, knock sensors are standard now. But since the FA20 is designed for Premium it's going to run less efficient on regular making the end cost the same or negligible.
OP, run the highest grade unleaded 93 AKI octane if you can, you won't regret it.
Quote:
Originally Posted by terrypm
I wonder what the owners manual states about using 100% gas or the blended gas with 10% ethanol? I know the ethanol blended gas has less energy than 100% gas so you get worse gas mileage with it.
Gas prices near me:
10% ethanol
87- $3.28
89- 3.38
91- 3.52
100% gas
87- 3.54
89- 3.79
91- 3.90
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In some states, only premium grades can be Ethanol free. The Twins' manual(it's like page 272 or something) says 10% Ethanol is perfectly fine, it's even tuned specifically for it, but it says to not run anything beyond that. Disappointing if, like me, you want to run E85 but that's normal for all sporty cars.
Quote:
Originally Posted by terrypm
from Wikipedia:
Ethanol contains approx. 34% less energy per unit volume than gasoline, and therefore in theory, burning pure ethanol in a vehicle will result in a 34% reduction in miles per US gallon, given the same fuel economy, compared to burning pure gasoline. Since ethanol has a higher octane rating, the engine can be made more efficient by raising its compression ratio. In fact using a variable turbocharger, the compression ratio can be optimized for the fuel being used, making fuel economy almost constant for any blend.[25][26] For E10 (10% ethanol and 90% gasoline), the effect is small (~3%) when compared to conventional gasoline,[55] and even smaller (1-2%) when compared to oxygenated and reformulated blends.[56] For E85 (85% ethanol), the effect becomes significant. E85 will produce lower mileage than gasoline, and will require more frequent refueling. Actual performance may vary depending on the vehicle. Based on EPA tests for all 2006 E85 models, the average fuel economy for E85 vehicles resulted 25.56% lower than unleaded gasoline.[57] The EPA-rated mileage of current USA flex-fuel vehicles[58] should be considered when making price comparisons, but E85 is a high performance fuel, with an octane rating of about 94-96, and should be compared to premium.[59 |
Ethanol has less energy per gallon, so it's more expensive than you would think, but it makes more power. E85 is the bees' knees for hotrods.
BTW, the EPA does not test MPG on any Ethanol content. They calculate the MPG for all cars based on BTU content.