rscott22

Hey guys,

I have had my car for 2 years now and it seems like my gas mileage has really dropped I used to get 30-31 miles to gallon now i'm lucky to get 25-26 . Has anyone else on here experienced these problems? Is there a recall or something I don’t know about to fix the problem? If anyone could shed any light on this situation I would deeply appreciate it!

Thanks,
Ryan

laobo979

iTrader: (5)

Yeah its winter change over. During the summer you'll get better mpg then when winter time hits. It no big deal.

rscott22

I just dont remember it dropping this much last winter.

heyarms

iTrader: (5)

I hear so much about the "bad gas mileage in the winter"... Texas just doesnt get cold enough for it to effect mine i guess Our gas is cheaper too, win-win situation haha.

jbjones85

iTrader: (20)

My first though was the change in the temperatures as well. How many miles you have on it? Maybe the air filter is dirty?

rscott22

46,000 and a brand new K&N filter in it.

jbjones85

iTrader: (20)

always use KNN or did the drop in MPG's happen about the same time as the filter went in? More air = more fuel maybe.....

nbressette

Check your tire pressure. Colder weather = lower pressure. Could gain as much as 3mpg is one of your tires is low.

msubee

lucky you still have 25-26 mpg on your IS250, now i'm used to get 17-18 mpg on my IS350

Toymota

I'll suggest what I said in a similar thread: whenever you start the engine from cold, it runs rich burning extra gas to warm up faster. If you do a lot of cold starts, or short trips where the engine has to warm up again each time, your mileage will be horrible.

CleverName

Most Winter MPG complaints stem from the introduction of "oxygenated" fuels.
Burns cleaner, but with a reduced BTU output. Wont be long till it required year round, I'm sure.
http://epa.gov/otaq/oxygenate.htm

Vince

MyIS350G

iTrader: (6)

I got an IS250 as a loaner as my IS350 was in for recall. Damn i get ~30mpg!! but average is about 26. there is no way you can get above 30 unless its all highway.

Sango

iTrader: (10)

It is also possible that the gas stations have changed to a "winter blend" which would affect the MPGs. Once it changes back to the regular blend, the MPGs should go back up.

I noticed mine has dropped in city speeds on my 250 AWD, but during at freeway speeds not as much.
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On a side note, I was told that fuel quality in Canada, even thou it is higher priced is better than US because Canada has stricter regulated standards than US.

rscott22

I drive all highway with the car for work one way is 50 miles.

Kurtz

iTrader: (1)

You probably wouldn't know it living in CA traffic, but the 350 can get nearly 30 too... flat, all highway steady speed I hit 29.7 tank avg for about a 300 mile trip over thanksgiving... (only time I actually saw >30 average for a tank in a 350 was on an earlier trip part of which I was coming down out of the mountains so I don't count that)