Sexus ES300 Posted April 12, 2010 Share Posted April 12, 2010 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) Quote Link to comment Share on other sites More sharing options...
mxl4729 Posted April 13, 2010 Share Posted April 13, 2010 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. Quote Link to comment Share on other sites More sharing options...
Sexus ES300 Posted April 13, 2010 Author Share Posted April 13, 2010 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? Quote Link to comment Share on other sites More sharing options...
Sexus ES300 Posted April 13, 2010 Author Share Posted April 13, 2010 btw do u have pics for the pc in your car, ive been considering building one and hooking it up to my head unit(double din 6.5in) Quote Link to comment Share on other sites More sharing options...
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