fxturbo

what could cause the decrease mpg ? Thanks

Maxiii

mine goes from anywhere from 320 - 355 when i fill a full tank.

link13

Heavier foot? More surface street driving? More time idling / sitting in traffic? That amount of variance is actually pretty small.

arentz07

10 miles per tank, on a 17-gallon tank, is only a difference of about 0.6 miles per gallon. Nothing to worry about IMHO unless it drops even more.

For what it's worth, mine varies between about 310-320 in the summer to about 295-300 in the winter (IS 300 AWD here).

BlazeL

Someone spending a bit of time in Sport # huh?
I am averaging about 340-350 every tank but spend about 75% of the time in ECO and on the highway.

doodlebug

I think it goes by your previous tank total. So, with your last tank of gas you averaged less mpg than the previous tank.
If you average more mpg on this tank it will show a higher total at next fill up.

ARM350F

Ajowhan

iTrader: (1)

It goes with your current MPG I believe and vary depending on how you drive. When I first got the car, it was 330, then I notice 335, then 350 and 360. Now that I am cruising 60 miles highway a day with minimal traffic. I am getting 390 a tank

link13

270 tops here. I commute in SoCal. Not the car's fault and I would never get a Prius or an electric car.

unioncorps

It really could be anything. Driving habits, tires not at the optimum PSI, etc. Now that it's getting colder I think more detergent and additives are added to gas when you fill up at the pumps, which can also account for lower MPG.

kr2015

^ +1. Lots of things can affect it. If I'm driving highway speeds for most of the tank, I can get 330 with my IS 250. With a lot of stop-and-go traffic, I've gotten under 300. Tire pressure, drive mode, driving style, etc. all factor in too.

eyecue

Wow I was getting 420 when I first got the car but now i'm getting around 380ish. I have a 2014 IS250. I'm only basing this off the number though when I fill up not sure if i'm actually getting those miles, most likely not. My average says it's about 22-24 I drive mixed city and highway and have a heavy foot at times.

Olasek

Is this a joke??
Wind/Weather could be responsible.

kr2015

Wow!!! I've never even come close to that!