Rashawn

I'm losing a lot of gas and don't know why. I don't see a leak, but I'm filling up my tank more frequently.

mandyfig

How many miles do you do on a gallon of gas...let's start there. Filling up frequently does not tell us anything.

Bichon

Winter blend gasoline and cooler temperatures both cause a drop in fuel economy that might explain it. Like Mandyfig said, if you could provide some additional information like your car model (IS250, IS250AWD, IS350?), your typical driving (city/highway, long vs short trips), and your MPG, it will help us determine whether you really have a problem.

gompka

iTrader: (6)

My is350 takes a pretty big hit in the winter on mostly city driving, i go from 17-18mpg to 12-13 when it gets really cold.

Zmon

iTrader: (2)

Can just about +1 this. Every time I take my IS up to Chicago for Christmas, mpg takes a huge dump to about 15-16. Low temperature and winter blend gas are not a good combination if you want good mpg.

Rashawn

It is a 2007 IS250. I live in Southern California and park my car in a garage, so it's only out in the cold a few hours a day. I drive an average of 15 miles during the week on city streets and maybe about 40 miles on the highway on some weekends. I'm not 100% positive of the MPG, but if I had to guess, I would say it's about 18 MPG.