In article <d582a29ajr7im067gj8hvjvluc6evmb9cr@4ax.com>,
Roy Starrin <starrin@verizon.net> wrote:

> That takes me to my prime question since I bought my new Civic last
> week (and gave the '88 to charity). What the hell is MMT and top tier
> gas?

MMT is methylcyclopentadienyl manganese tricarbonyl, a gasoline additive
made by the Ethyl Corporation. Ethyl is the bunch that brought you
tetraethyl lead.

The fear is that MMT, which contains manganese, will cause central
nervous system damage to people who live in densely-populated areas.

Top Tier Detergent Gasoline is a set of standards created by a
consortium of automakers--BMW, GM, Honda and Toyota--for high-quality
detergent gas. The only problem I've got with this is that none of the
gas companies on the list at http://www.toptiergas.com/retailers.html,
except for Shell, sell gas in Cumberland County, NC.

Oh...to answer the OP...except in very extreme circumstances, like when
you've been running stale gas and now your injectors are partially
clogged, additives don't do much for you.

--jm