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#1
08-09-2012, 02:28 PM
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Gas with Ethanol and my MPG
So pretty much all regular gas has 10% ethanol in it these days, or at least "up to 10%" it says on the pumps. So one local gas station by me has ethanol free gas (100% gas, 0% ethanol) so I thought I would try a tank of it to see if my MPG changes at all. They only offer ethanol free in premium grade, 91 octane rating. Regular gas was $3.40 and the premium ethanol free was $4.05 a gallon. I filled up Monday morning (took 16.5 gallons). My regular MPG for just going to and from work averaged 30.5mpg last tank and all summer has been between 30-32mpg for the whole tank. So far (~100 or so miles into this tank) I'm averaging 35.5mpg with the usual to and from work commute. So I wont make any conclusions until the tank is empty, but so far looks like a solid 4-5mpg gain! I also figured out that a 5mpg gain would be needed to offset the extra cost of it.
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'11 Accord EX-L Navi I4 PMM '08 Accord EX-L Navi I4 PMM (Traded in) '06 Accord SE I4 (Traded in) '95 Accord EX I4 (Sold in 06) 
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#2
08-09-2012, 03:17 PM
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doesn't the 11-12 i4 models average 34 mpg anyways?
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ASM/Blk EX-L i4 Sedan Auto aka "sUbTLe" Done: OEM Splashguard - Custom Magnaflow Exhaust 14832 - JDM Emblems - Takeda SRI - LED Interior/License (White/Blue) - Blacked Out Grill/Window Trim - 5% Rear 50% Front - Philips 9006 Halogen Headlight Bulbs - Hankook Ventus V2 To Do: TSX RSB/Shiftknob - Coilovers - 8.5 Trunk/Front Bumper Conversion - USDM Mugen Grill - Headlight Tint - Painted Engine Cover - Blacked Out Gearbox - Lid Spoiler - Window/Moonroof Visor - P2R Throttle Body Spacer
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#3
08-09-2012, 03:29 PM
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Quote:
My commute is mostly rural (50mph with a few stops/lights) roads with a 2 mile highway stretch. My main point here is the difference in normal (all summer) 10% ethanol tanks and this tank without any ethanol. I will post my final results once the tank is empty and keep using the ethanol free gas for a while and hopefully get a highway mpg number also.
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'11 Accord EX-L Navi I4 PMM '08 Accord EX-L Navi I4 PMM (Traded in) '06 Accord SE I4 (Traded in) '95 Accord EX I4 (Sold in 06)
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#4
08-09-2012, 03:57 PM
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It is true that while ethanol can have nice octane numbers, it is lower in actual useable "fuel" compared to petrol gasoline. I HATE that there are no 100% stations within 100 miles of me!
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#5
08-09-2012, 09:59 PM
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Quote:
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2010 CBP EX-L Coupe 6/6
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#6
08-10-2012, 04:40 AM
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100% gasoline has 125,000 BTU/gallon, 90% gas and 10% ethanol mix has 120,000 BTU/gallon. This means you get 4% less energy on every gallon of ethanol and your gas mileage will be reduced by about the same amount. The increased octane number is a plus tho.
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2000 Accord SE I4 F23A1 Auto @160k miles - My Daily Driver 1998 Accord LX I4 F23A1 5 speed - sons car 1987 Accord LX 5 spd Owned for 17 years sold @155k 1986 Accord LX Auto Totaled @125k miles 1983 Accord LX 5 spd My Second Accord 1978 Accord LX 5 spd My First Accord
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