Originally Posted By: kschachn
Originally Posted By: john_pifer
Originally Posted By: sir1900
If price is negligible, choose Shell. V-Power doesn't contain ethanol.
That's not the case in the USA. All fuel now contains ethanol unless specified otherwise.
Yes, not all states require labeling for fuel containing ethanol, so it is possible that some E10 in some places will not be labeled. But for the most part in most states it is labeled.
And you are correct it is not brand nor grade specific. For example here in southeastern Wisconsin all fuel sold contains ethanol since we are in an EPA non-attainment area (even at the Milwaukee marina). Here, Shell V-Power has EtOH just like any other brand or grade but outside the five-county non-attainment area it may or may not contain alcohol.
To the OP's question however, how would one determine gasoline "quality" between different major brands?
Speaking of WI, on a recent trip through the Northland we saw CENEX and KWIKMART stations offering the option of both 87-octane and 91-octane gasoline that contained NO ethanol.
What a pleasant surprise.