Just one source... http://en.wikipedia.org/wiki/Octane_...nal_variations

 

I have only used V power since Ive gotten the car. I love it but have no scientific research to show why. Highest mpg on a tank Ive received is 32 mpg ( this was 85% highway but I did have cruise set at almost 80) I always get at least 27mpg- no matter the conditions. And i do believe that AC off helps with mpg. Just letting the air flow through with no windows down has definitely helped my mpg. However, the biggest difference in getting higher gas mileage- dont accelerate hard from red lights and while passing and ***FOLLOW 18 WHEELERS- drafting works and I guarantee can get most people on here at least low 30s in mpg. In fact, following trucks/ suvs/ and 18 wheelers help our cars, which already have very low drag, cut through the air that much easier.

 

If anyone of you not using the OEM tires anymore, your mileage will get worse.

 

I dont have stock tires (bridgestone pole positions) and MPG is the same. I do understand that the michelins have lower rolling resistance but have noticed no real decrease- maybe 1mpg is some driving conditions.

 

I've got Nexens(?) and my mileage is pretty high. Wouldn't say that anything but Michelins will suffer diminished mileage.

 

FWIW, I recieved the following via e-mail awhile back about gas fill-up which might change your mpg...

-------------------------------------------------------------------
TIPS ON PUMPING GAS (Good information)

I don't know what you guys are paying for gasoline.... but here in California we are also paying higher, up to $3.50 per gallon. But my line of work is in petroleum for about 31 years now, so here are some tricks to get more of your money's worth for every gallon.

Here at the Kinder Morgan Pipeline where I work in San Jose, CA we deliver about 4 million gallons in a 24-hour period thru the pipeline. One day is diesel the next day is jet fuel, and gasoline, regular and premium grades. We have 34-storage tanks here with a total capacity of 16,800,000 gallons.

Only buy or fill up your car or truck in the early morning when the ground temperature is still cold. Remember that all service stations have their storage tanks buried below ground. The colder the ground the more dense the gasoline, when it gets warmer gasoline expands, so buying in the afternoon or in the evening....your gallon is not exactly a gallon. In the petroleum business, the specific gravity and the temperature of the gasoline, diesel and jet fuel, ethanol and other petroleum products plays an important role. A 1-degree rise in temperature is a big deal for this business. But the service stations do not have temperature compensation at the pumps.

When you're filling up do not squeeze the trigger of the nozzle to a fast mode. If you look you will see that the trigger has three (3) stages: low, middle, and high. In slow mode you should be pumping on low speed, thereby minimizing the vapors that are created while you are pumping. All hoses at the pump have a vapor return. If you are pumping on the fast rate, some of the liquid that goes to your tank becomes vapor. Those vapors are being sucked up and back into the underground storage tank so you're getting less worth for your money.

One of the most important tips is to fill up when your gas tank is HALF FULL. The reason for this is, the more gas you have in your tank the less air occupying its empty space. Gasoline evaporates faster than you can imagine. Gasoline storage tanks have an internal floating roof. This roof serves as zero clearance between the gas and the atmosphere, so it minimizes the evaporation. Unl ike service stations, here where I work, every truck that we load is temperature compensated so that every gallon is actually the exact amount.

Another reminder, if there is a gasoline truck pumping into the storage tanks when you stop to buy gas, DO NOT fill up -- most likely the gasoline is being stirred up as the gas is being delivered, and you might pick up some of the dirt that normally settles on the bottom.
Hope this will help you get the most value for your money.

DO SHARE THESE TIPS WITH OTHERS!

Fill up in the morning in the slow mode when your tank is half full but not when the tankers are filling the storage tanks.

-----------------------------------------------------------------------

 

Thank you for posting this.

 

I ordered a wheel tire package from Best Wheels out of Miami for my Scion xB last December 06. Love the wheels (17') but I have replaced various tires 5 times. Unfortunately road hazzard wasn't part of the package. Have you had similar issues?

Next time one goes, I'm simply buying 4 new tires of a different brand along with road hazzard.

 

OMFG. You wrote that only 3 months ago.

 

Sorry I never replied. I buy my tires as sets from Costco. In addition to free rotations and other services, they include road hazard coverage. I had a couple of repairs to my last set on my '87 Jeep. I just hop they can get me better than crappy OEM Michelin equivalents when my Nexens are used up.