bad mpg in metro

[barteldt]

my geos mileage has gone down from 40-45 in town to about 32mpg any ideas why

[BeoWolfe]

A few things to check....

If its been a while since you tuned it up then go ahead and throw some new plugs/wires on it and check your timing. Next you might want to check out your ECT sensor to see if its reading properly - a bad ECT will butcher your MPG :O.

[jats03]

My 97 metro is the same way on a full tank of gas I only get around 150 miles I even had a full tune up done.

[odie13]

What's the ECT?

[barteldt]

ive narrowed it down a little the mpg only drops when outside temp is below 20 degrees. then i lose around 10mpg

[geozukigti]

Colder air is more dense. Use turbo theory. More air, more gas. Just about any car will lose MPG when it gets really cold out. Cold air gives ya a few more hp though. That's where your gas is going. Try gettin some Bosch Platinum +4 spark plugs.