Date: Sun, 27 Jan 2013 23:52:17 -0500
From: "Mike B." <yahoo at omniphile.com>
To: WSFA members <WSFAlist at KeithLynch.net>
Subject: [WSFA] Re: weather preparations
Reply-To: WSFA members <WSFAlist at KeithLynch.net>

On 1/27/2013 10:59 AM, mark wrote:
> On 01/27/13 02:54, Tamar Lindsay wrote:
>> The difference in mpg may also be related to the anti-smog doohickey
>> that lowered gas mileage significantly.  One car was from before
>> then, the other was from after.
>
> Nope. There've been catalytic converters on cars since, um, wikipedia
> says '75.

Catalytic converters are just one of many anti-pollution devices that
might be on a gas engine.  There's also exhaust gas recirculation,
positive crankcase ventilation, evaporative emissions controls, choke
heaters, mixture tuning, air injection, timing changes, leak detectors, etc.

-- Mike B.