ArizonaA6

$2.55 in Tucson for 91 (prem)

wuk

Costco in Chicago area (NW burbs Lake Zurich) $2.71 for 93 octane. completely stoked! Costco is usually the cheapest in the area.

jasonlitka

I hate all of you. I filled up a week ago @ $3.45/gal...

Philly suburbs.

irenesbob

A week ago is a long time ago the way the prices have been dropping. I check GasBuddy.com to see who's got the lowest price in my area and go to the cheapest one of the reliable brands if I am going that way, otherwise I use my local guy who is usually $.06 higher per gallon than the cheapest.

jasonlitka

I drove by a few stations on my way to work this morning and all were still in the low $3.20's.

Redd

So who's got a flex-fuel engine, and has done actual mpg highway runs to compare regular/vs/premium? Anyone?

audijess1972

$2.61 for 93 octane by my house in Houston

newmoon

Flex-fuel actually means being able to run on up to 85% ethanol blend. But because ethanol contains less energy than gasoline, you will actually get 15-30% worse mileage on ethanol. Source: Flex-fuel Vehicles

Most gasoline in America has up to 10% ethanol blended in, but I was at a station today that was selling pure gasoline (87 octane) for $2.89 while the E10 87 octane was $2.39. The pure gasoline should get you better mileage but probably not 20% better to make up for the price difference. (Oh, I paid $2.79 for 93 octane premium).

As to whether higher octane gets you better mileage, well I have run a few tankfuls of 89 octane on 550 mile highway runs and could not measure any difference, as in within +/- 1 mpg. Note that on the highway, you are not putting much load on the engine, so it doesn't really need the knock resistance of 91 or 93 octane. However, in city driving where you put more load on the engine like if you accelerate hard from a standstill, I have gotten some slight engine knocking even on 93 octane. If this happens often enough, the ECU will pull back ignition timing and the engine will not operate as efficiently, and hence your gas mileage will suffer.

dicktahoe

$2.77 for 91, at Costco Reno, NV yesterday. Projections are the lowest prices will occur nearest to the refineries in the south--starting with Texas, OK, TN, LA, etc.

BigDawg

Just paid $2.49 for Shell Z Power in Florida. It's actually $2.99 but I have one of those Reward cards and I had 60 cents per gallon on it. Pretty sweet.