I think I'll take this on,
Gasoline, as it comes out of the refinery is, with the exception of octane, the same, regardless of brand.
It will also destroy your engine if used in that form.
Each Tier 1 supplier (Mobil-Shell-BP-Exxon-Marathon, Well, you get it, the primary brands) has their own additive package that is added to the White gasoline as it is dispensed into the tanker, or direct pipelined to a retailer.
This package will have a specified amount of detergents,dye,carbon control compounds etc. In addition, each grade of fuel has a slightly different package, and finally, there are more than 50 different specifications depending on where the fuel is marketed due to EPA considerations.
Now, some retailers, Sams Club for instance, will be on contract with, say, BP for this year.
That means, BP will supply Tier 1 quality fuel for the duration of the contract.
Most of the chain retailers have this arrangement.
Often, the store manager(not the teenager!) will be able to tell you who this years supplier is.
So, in those respects GAS IS GAS, sorta.
As some have found out, sometimes a engine is brand specific and will operate best on a particular brand or grade. There are lots of theorys but nothing more.
Now comes the Tier 2 operations. These are the non-branded buy low type operations.
As I go along here, I need you to remember, gasoline has a freshness life, just like any other perishable.
Typically, white gasoline has fallen out of grade within 15 DAYS!
That means, even with the additive package, it can no longer be sold as a Tier 1 product.
Well, ya sure cant throw it out!
So, whats done is ,the gasoline is restabilized with liquid propane. This'll get about another 15 days.
So, thats what gets marketed out of the buy-low type retailer.
And that liquid propane does nothing for mileage or injector life.
So, in summation, GAS IS GAS,
But, what comes out of the pump isn't
Hope I didn't start too big a fire, this stuff is flammable,
lol ........Rob