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Old 02-20-2013, 12:26 PM   #21
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DW's BMW Z-4 also requires premium. I inadvertently used reg once and did not notice any significant diff in mileage or prerformance - but then I am not allowed to drive it much. Just to the dealer when needed.
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Old 02-20-2013, 03:21 PM   #22
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I got about 22 MPG on Gas with no alcohol and about 19 MPG with 10% alcohol. This is on a V8 pickup truck which is not very efficient in the first place. Unfortunately I cannot get gas without alcohol in my area.
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Old 02-20-2013, 03:51 PM   #23
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In have found that the only accurate way to compute mileage is the old 'write down the mileage, the gallons and do the math'. My fancy new hybrid can be off by as much as 15% using the computer display for trips under 100 miles. Two tanks usually gives accurate results. And 15% is a whopping 6 mpg on this baby. Gloat!
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Old 02-20-2013, 05:11 PM   #24
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On a "same day" trip, I'd agree with Midpack on the point about wind. On a similar round trip last year... from Leesburg, to Lake City, my 98 Town Car went from 28MPG to less than 20MPG... Rte 75. Same car, same distance, one tank of gas. A very slight wind, but enough to affect the mileage, or at least that's what I figured.
I find the same thing here on my round trip of just 30 miles back and forth to the lake. A 10 mph wind does the job.

http://privatenrg.com/#WindAssistScreen

My 96SLS and the Town Car are supposed to take Premium, but haven't tasted it since we bought the cars, except for a few test fill ups that didn't prove anything.
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Old 02-20-2013, 05:37 PM   #25
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Have you shown reproducibility of the Costco results?
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Old 02-20-2013, 05:42 PM   #26
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Originally Posted by kaneohe View Post
Have you shown reproducibility of the Costco results?
We need a double blind study.
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Old 02-20-2013, 06:29 PM   #27
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Ethanol content will indeed affect mileage. Some gasoline has 0% ethanol while others contain up to 10% in regular or premium grade gasoline. I doubt that the station delivery driver mistakenly put 85% ethanol in the tank but that will decrease your mileage by 4 mpg. In a more extreme example, my car is outfitted to burn 85% ethanol and while that mix will produce more power and higher octane, it burns faster and results in a decrease of 4 mpg. I calculated that it has to be 70 cents less in price than regular to break even; that rarely happens so I'm back to using regular.
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Old 02-20-2013, 06:45 PM   #28
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Gasoline gallon equivalent - Wikipedia, the free encyclopedia


Here's a wiki that lays out btu content of various blends. Ethanol is much lower than pure gas.
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Old 02-20-2013, 06:47 PM   #29
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More on ethanol vs gas-

Ethanol
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Old 02-21-2013, 06:18 AM   #30
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If it only happened once and things returned to normal afterward I'd just chalk it up to an unknown aberration and let it go at that.
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Old 02-21-2013, 09:25 AM   #31
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Thanks for the information on Ethanol in our gasoline.

We will all be happy campers when 15% ethanol becomes common.
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Old 02-21-2013, 06:21 PM   #32
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Quote:
Wind conditions were similar each way.
But maybe driving with the wind in one direction and against it in the other?

Quote:
We need a double blind study.
As in the movie "The Scent of a Woman"?
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