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Breakdown of E85 mixtures & MPG performance
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03-12-2013, 03:48 PM | #1 |
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Breakdown of E85 mixtures & MPG performance
E100 (100% ethanol) has a yield of 34% less gas mileage than gasoline (10% ethanol/90% gas). Which means running 100% E85 (85% ethanol/15% gas) should yield 28.9% less gas mileage.
When running E30 (30% E85/70% Gas), it should yield 8.7% less gas mileage. When running E40 (40% E85/60% Gas), it should yield 11.5% less gas mileage. When running E50 (50% E85/50% Gas), it should yield 14.5% less gas mileage. When running E85 (100% E85/0% Gas), it should yield 28.9% less gas mileage. My local Shell gas station carries E85 for $3.79 and 93 for $4.39. That's a $0.60 difference or 14% savings a gallon over 93 octane. This means that when our cars tank E90 (16.6 gal with reserve) is full with E30 (5 gal of E85 + 11.6 gal of gas) we save an additional $3.00 at the pump. This also means that we lose mpg. E30 = If you average 22mpg then you’ll average 20.1mpg. (Drops from 365miles to 333 miles per tank) {Savings of $3.00 at the pump} E40 = If you average 22mpg then you’ll average 19.5mpg. (Drops from 365miles to 323 miles per tank) {Savings of $3.99 at the pump} E50 = If you average 22mpg then you’ll average 18.8mpg. (Drops from 365miles to 312 miles per tank) {Savings of $4.98 at the pump} E85 = If you average 22mpg then you’ll average 15.6mpg. (Drops from 365miles to 259 miles per tank) {Savings of $9.96 at the pump} -So paying $3.79 for E85 and $4.39 for gas 93 at the pump nets to this. E30 = You’ll be paying an average of $4.21 a gal - [$0.21 per mile] E40 = You’ll be paying an average of $4.15 a gal - [$0.21 per mile] E50 = You’ll be paying an average of $4.09 a gal - [$0.22 per mile] E85 = You’ll be paying an average of $3.79 a gal - [$0.24 per mile] Now I’m trying to figure the delta on how much power is introduced when 10% increase of ethanol is introduced (E30, E40, E50)... Maybe someone can give us some logs on their testing. Last edited by AltecBX; 03-12-2013 at 07:34 PM.. |
03-12-2013, 03:51 PM | #2 |
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Now compare running E85 to 100oct race gas (available at some gas stations here in CA) that costs $10/gallon. Because that is more comparable in terms of performance
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03-12-2013, 03:59 PM | #3 | |
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03-12-2013, 04:11 PM | #4 | ||
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03-12-2013, 04:22 PM | #5 | |
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03-12-2013, 05:05 PM | #9 |
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03-12-2013, 09:37 PM | #14 |
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Great info, I could definitely tell the difference on miles per gallon when running E50.. But never really got around to track dollars per mile. I think I was averaging about 14 - 15 miles per gallon with E50. But then again My pro tune Wasn't designed for miles per gallon.
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03-12-2013, 09:37 PM | #15 |
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Yup, $4.19 for 91 octane around here and $3.55 for E85. Typically 50 to 60 cents difference in price, but a huge difference in performance.
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03-12-2013, 09:38 PM | #16 |
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03-13-2013, 10:15 AM | #18 |
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the bottom line is - assuming 22mpg on 93, and $3.79 for E85 and $4.39 for 93:
cost per mile on 93: 20 cents per mile on e85 (28.9% less mpg): 24 cents per mile small price to pay for the added performance. |
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03-13-2013, 10:22 AM | #19 | |
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But I rather play in the E30-E40 range as you're only paying an extra penny a mile compared to 93 to play. Once we get more data on the performance increase on the extra mixtures, we can then justify the extra price to performance. Don't forget you'll need an upgraded LPFP to run E85. |
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03-13-2013, 10:38 AM | #21 |
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03-13-2013, 12:00 PM | #22 |
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Keep in mind the 400, 416, 430, 450, 465 variances some are "full" E85 ready, some are semi E85 compatibile and some are NOT E85 compatible at all.
The semi E85 ready version needs to be converted As for why there is a 400, 416, 430, 465 of the same part number even though it is "full E85" ready from what I have "read" they have difference turbines. I am still awaiting a confirmation on this by Walbro. It could be flow modification done by different vendors, idk. Also, there are knock off Walbro pumps in the market so be careful Here is the Walbro PDF Data Specs for each part number http://www.tiautomotive.com/wp-conte...talog_2013.pdf Just make sure the Walbro Part # is F90000267 for Full E85 compatibility Last edited by BQTuning; 03-13-2013 at 12:25 PM.. |
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