newis350

I am only getting about 22-24 mpg on the freeway during my daily commute of about 80 miles per day. I set my cruise at 75 mph. Any suggestions on why the mpg is so bad?

All tires properly inflated.

loftus112

iTrader: (2)

First of all, if you're worried about mpg you should of gotten an IS250. However, having 22-24 (22-25 mpg) hwy is about average when the IS250 hwy runs about 25-27 hwy.

kikaida

Very true to the first post. If your worried you should had gotten the 250. Although having 22-24 sure is way better than what im getting... 19-20 lol.

tt061880

you folks live in CA wiht a lot of hills that why u get bad hwy mpg. In florida I get at least 26mpg on the highway, I usually see 27/28.

sirkfc

A few points. If your car is still pretty new, it needs a few thousand miles to really get up in MPG.

Second, maybe it's the non-freeway parts of the commute that's hurting your MPG, as some aggressive driving there will negate a lot of the effort on your highway run.

Third, 75 is hardly the most optimal MPG speed. Bring it down to 65 and you'll see a significant improvement. Even better in the 50's, but that'll drive everybody on the freeway nuts.

VikH

iTrader: (5)

Drive slow homie. Set cruise at 55 and you will get 30 MPG. The 250 only gets a couple mpg more which doesn't make a difference.

Allen K

iTrader: (4)

I set it to 70 on my 30 mile commute and I average about 27-29

bagwell

if you want to do 75 and get 30mpg -- learn NASCAR driving techniques and DRAFT . In my comuuter car I just get behind a big SUV or pickup truck -- I don't tailgate, just stay behind them. Stay far away from 18 wheelers unless you want a windshield that looks like the night sky (lots of stars!).

100plus

That foot got a mind set for speed lol. Try driving on the speed limit. and ask Vik said, put it in cruise. Also remove any extra weight that you dont need (i.e. junk, miscealenous items, dead bodies, etc etc).

mwaull

me too . . . hell when ive had it set about about 65-70 ive hit 30 mpg a couple trips in my 350.

RocketGuy3

iTrader: (1)

How low are you running your AC? Do you have the windows or moonroof open? Are you carrying a porcelain bird bath in your trunk?

You should definitely be getting better mileage than that I think... This has been happening regularly? Or you only noticed it on the latest one or two trips?

I get very near 30 mpg going 75-80 on the hwy... and that's without cruise control, and somewhat aggressive driving. So it sounds like something isn't right. I know there's going to be some variance, but that seems excessive.

Allen K

iTrader: (4)

If he could get rid of the bodies then he wouldn't need to make the commute

mwaull

how many miles you have on your IS? I noticed a mpg improvement after about 10k miles.

al503

I just drove up to Seattle and back (from Portland) and my average was 30.5 mpg according to the trip computer. I averaged 63 mph, again according to the computer, and that was with a little stop and go getting out of Portland. Once that cleared up, I was doing between 65-85 mph.

Zanorath

With stock 18's on a 350 I was getting around 28-31 highway when on cruise depending on the speed (60-70). Best I ever got was 34mpg for 60 miles when going 60 following not *too* closely behind a truck.

With aftermarket 20's on the rear I'm getting about 23-25mpg under the same conditions. I'm not sure exactly how much heavier they are.