Better Gas Mileage using Shell Gas vs Chevron

[BFeller]

I understand that as various refiners push their product down the actual pipeline, it flows like cars on a frieght train, with no air gap. So the beginning and end of a large slug, where they might be a cross between two companies products, is sold on the open market at the gas terminal via the spot market. The independent stations are the primary customers of the spot market. So they may end up with buying a cross mix of two major refiners version of regular. That unknown is one reason why I stay away from the independant stations.

[Porsche9]

Originally Posted by BFeller

I understand that as various refiners push their product down the actual pipeline, it flows like cars on a freight train, with no air gap. So the beginning and end of a large slug, where they might be a cross between two companies products, is sold on the open market at the gas terminal via the spot market. The independent stations are the primary customers of the spot market. So they may end up with buying a cross mix of two major refiners version of regular. That unknown is one reason why I stay away from the independent stations.

I would think this situation happening depends on where you live. In Arizona we use to get all of our gasoline from one refinery in California but a few year back they built a pipeline from Texas. Not sure if it gets mixed but it certainly helped lower prices.

Ethanol gets mixed into gas so there could be some variation on the percentage mix in the final product that could impact mileage as ethanol negatively affects mileage as it's less energy dense then gasoline.

Again, stick to Top Tier gasoline and you should be fine.

[Luv2Box]

When I fill the tank with Chevron my OBC reads 340 miles for the tank and when I fill with Shell it reads 299 miles for the tank. The reading is taken right after the fill sitting still. Any thoughts on what causes this?

[cas951]

Originally Posted by Luv2Box

When I fill the tank with Chevron my OBC reads 340 miles for the tank and when I fill with Shell it reads 299 miles for the tank. The reading is taken right after the fill sitting still. Any thoughts on what causes this?

Did you check to make sure conditions are the same? Your current average mpg when filling the tank.

[Luv2Box]

Originally Posted by cas951

Did you check to make sure conditions are the same? Your current average mpg when filling the tank.

Yes conditions appear to be the same the fuel gauge needle is right on the full mark. For some reason the OBC is indicating I will get more miles on a tank of Chevron than a tank of Shell.

[BYprodriver]

While I worked at both Shelby & Saleen during the EPA emissions certification process for new manufactured vehicles, 2 different emissions certification engineers were adamant about using nothing but Chevron Supreme in test cars. That's all I use & it's usually the most expensive option. I just paid $4.12 per gal at my local station.

[Porsche9]

Originally Posted by BYprodriver

I just paid $4.12 per gal at my local station.

$4.12 per gallon! What's in that gas that it's $4.12 a gallon? The Chevron by my house is $2.83 for super.