On 6/14/2015 7:37 AM, dpb wrote:

snip

If we're talking a light-duty pick-em-up or the like, it's just no big
deal unless again it sits for months unused...

A lot of these additives are to make the buyer feel good, but they do
nothing for the engine they are added to. Like recreational oil changing
far more frequently than necessary.

In California, there are very high minimum standards for detergent
gasoline additives. Gasoline from Costco or other independent stations
meets the "Top Tier" standard. There is no advantage to buying gasoline
from Chevron despite their heavy marketing of "Techron" and their ads
imploring consumers not to buy gasoline at warehouse stores.

In some states there are no minimum standards for gasoline additives
separate from EPA's rather low standards and in those cases "Top Tier"
gasoline might not be available at the no-name stations. See
http://www.toptiergas.com/retailers.html.