[s-cars] re S4 mpg

[Taka Mizutani]

George-

When did you buy the S4 in question?

Have you changed tire sizes and/or brands/model during your ownership?

Have you changed anything else?

My fuel economy has changed noticeably when they started selling "E10" here
in PA. I attribute this to the lower energy content of ethanol vs. pure
gasoline.

I've seen fuel economy also affected by the condition of your O2 sensor,
cats and exhaust system- clogged cats, dead O2 sensor, clogged muffler can
all affect performance and fuel economy.

Finally, I noticed about a 2mpg reduction in fuel economy when I went from
225/45R17 tires on my old 200 to 255/40R17. But I also switched brands  and
models of tires, so I cannot say for certain that this is only due to the
wider tire.

I have noticed a drop to low 20s mpg in the Miata since I went to
Bridgestone RE-01Rs, I cannot see how I'd drop 4-5mpg from a tire model
change alone (I was running Falken RT-615 before), so I'm suspecting a shot
O2 sensor or a clogged cat/exhaust system as contributing to the loss of
mileage.

Taka



On Nov 14, 2007 12:12 PM, George Verbryck <georgeverbryck at yahoo.com> wrote:

> Sorry the car in question is a 1993 S4 , thanks for all the responses.
> Seems like maybe my mileage is not that much off of normal . Its just that
> when I bought this car in Salt Lake City and drove it home to California
> over about 1300-1400 miles I consistently got 375+ miles per tank and now I
> am getting maybe 280 miles to the tank still almost all highway driving
> around 80mph. 100 miles difference seems pretty large to me so thought I
> would ask. Having had a V8 previously I am no stranger to poor mileage I
> just thought it would somehow be better in the S4. :(
> Now I saw the most recent post about the spark plug 22 ftlb of torque and
> realize I did not do this when I installed my plugs it is best to just check
> them or take them out and reinstall them? I do not want to rebuild my head !
> Thanks George
>
>
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