why does my 1996 plymouth neon go from getting 32 mpg in the summer to 25 mpg when it gets cold?

Answer 1

The engine has to warm up before it begins burning fuel efficiently #1, Winter blend fuel is different from summer blended fuels, winter fuel contains more sulfer than summer fuel. This causes a faster burn in the combustion chamber to aid in cold engine start up.

Answer 2

You certainly have received much information here! I have/have had four Neons: '95, '01, '02, 05. My experience is that the mileage for city driving does markedly decrease in the dead of winter. Ditto in the dead of summer. I live in metro Chicago, and in most years my mileage would be about 21mpg during January. Due to your surprise at the mileage change, I assume that you either moved to a colder climate or just got the Neon this year. Assuming no other coinciding problem, your mpg is quite normal.

Answer 3

jtracer48 cold air is more dense than hot air. thats why turbo guys run intercooler as it produces more HP. warm air robs HP as the air is thin.


do not let your car idle for long periods of time. you will burn more fuel than if you was driving the car cold. just take it easy. like said the winter fuels will have a big impact on your MPG. but to 25 that is a big drop. might want to do a tune up. plugs wires and so on. maybe clean your TB. check your tire pressure and make sure they are properly inflated. other than that its a 10 year old car. it might just be worn out and never get what it use to.

Answer 4

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Answer 5

summer grades of fuel are different then winter grades.the higher the alcohol content in the fuel for winter,the less mpg's.winter fuel has less BTU,s then regular unleaded.this means you are using more fuel to get the same power.getting the engine up to operating temp helps,but warming it up gets you 0 mpg's sitting still.higher octane will not help,and will hurt the engine. you are getting the right mpg's for the season.it is a combination of cold weather...engine runs a little cooler and richer on fuel,winter fuel grades,letting it warm up.

Answer 6

In winter, your engine is colder and it takes longer to heat up to operating temperatures. The engine's computer sends a signal for a richer mixture of fuel to air until it is at the right temp. There can also be other reasons to consider, heavier air, more resistance in the moving parts until they warm and expand.

Good luck

Answer 7

Possibillities:1.Fuel pressure regulator return hose(line) restricted.2. Thermostat stuck open.3.Short trips do not allow engine to reach closed loop so it runs rich most of the time.4.Water tempurature sensor defective.MAP sensor could be defective.5.Lead foot.6.Throttle position sensor improperly installed.Start voltage on TPS should be .75 to 1 volt.7.Plugged air cleaner-if so replace.

Answer 8

For one it takes longer for the car to reach it's optium driving temperature, letting the car idle for a while in colder temperatures,

As well, a major tribute to your decrease in fuel economy in the winter season is the winter blend fuel they sell at the pumps which you have no control over and this usually attribute to a loss in your fuel economy of at least a couple MPG.

Some ideas to control your fuel mileage in colder weather:
plug in your vehicle
add a winter front/cold front cover

Some areas to always look at to control your mileage:
check your tire pressures
check air filter
replace your fuel filter every 30 to 40K Kilometers
check your spark plugs and wires
Regular tune-up

Answer 9

Yes, check the thermostat a good functioning thermostat should maintain the correct temperature of the the engine either in summer or winter.

Answer 10

Because you let your car warm up while you scrape windows or to just let it warm up for the heater to work. When it's sitting there it's getting 0 mpg