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Sexus ES300

98 Es 300 Mpg

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Around 6 months ago i was getting a steady 19 mpg but now im stuck at 17.

I already changed the pcv valve about a month ago.

Any thing else i should change? Im about to change the air filter(considering a K&N)

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i would say it is just becaue of the cold. now that it is warming up i think u will see it go back.

two reasons why it gets bad in the winter

Weaker gasoline

Gasoline doesn't vaporize readily at very cold temperatures. So oil companies formulate fuel differently for cold-weather markets in the winter. Unfortunately, the changes that provide better cold vaporization characteristics also result in less available energy for combustion. You won't get as far on a gal of winter gas as you will on a gal of summer gas.

Temp

Have a gander at these calculations for a Honda Civic hybrid at 60 MPH in varying ambient temperatures:

MPH-----AMBIENT-TEMP-----MPG (US)

60------------95----------52.98

60------------85----------52.62

60------------75----------51.16

60------------65----------49.12

60------------55----------47.22

60------------45----------44.67

60------------35----------43.05

60------------25----------41.54

60------------15----------39.41

60------------05----------38.09

Look at the extremes: the coldest MPG is 28% lower than the warmest.

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i would say it is just becaue of the cold. now that it is warming up i think u will see it go back.

two reasons why it gets bad in the winter

Weaker gasoline

Gasoline doesn't vaporize readily at very cold temperatures. So oil companies formulate fuel differently for cold-weather markets in the winter. Unfortunately, the changes that provide better cold vaporization characteristics also result in less available energy for combustion. You won't get as far on a gal of winter gas as you will on a gal of summer gas.

Temp

Have a gander at these calculations for a Honda Civic hybrid at 60 MPH in varying ambient temperatures:

MPH-----AMBIENT-TEMP-----MPG (US)

60------------95----------52.98

60------------85----------52.62

60------------75----------51.16

60------------65----------49.12

60------------55----------47.22

60------------45----------44.67

60------------35----------43.05

60------------25----------41.54

60------------15----------39.41

60------------05----------38.09

Look at the extremes: the coldest MPG is 28% lower than the warmest.

ah i see. I would think since the air is colder it is denser, kinda like a cold air intake improving mpg or a turbo with an inter-cooler. never thought about the gas additives.

thanks for the input, ever tried a K&N filter?

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