lil' IS300

Hey guys...for some reason no matter how I drive my car, I seem to get around 15ish mpg. I think the highest I have gotten is 17. I don't really understand how people are getting in the 20s because most of the time I am not driving hard at all. Is there something wrong with my car? I have around 5500 miles and my commute/everywhere I drive is local. BTW i have an is350

iceman1117

Is most of your driving in the city with high traffic? If so that could be why you are not getting better gas mileage. Alot of stop and go could be the result of your low MPG. Even with and IS350 you should be getting better gas mileage then an IS250. Yeah I know its hard to believe.

sirkfc

I'm not that surprised. My commute is 26 miles each way, with no more than 3 or 4 miles of stop light driving each way. I've been driving for max mileage recently, so I've been keeping a light foot and constant RPMs. My tank average on the computer is 23.5, a far cry from the 29 EPA Hwy. The spread between city and hwy is 8 (21/29), so you getting 8 less MPG than me is probably likely, especially if you do short local trips.

lobuxracer

iTrader: (2)

Just to be sure - you are running premium? Running regular can definitely kill your mileage.

Is your driving lots of stop and go or more freeway? Lots of stop and go eats gas.

It's winter, and that also eats more gas because you have to heat the engine every time you drive from a colder temperature. If you are driving short trips - under 15 miles - your engine never really gets fully heated, so you're spending a lot of money on gas just trying to get it fully warmed up, but it never happens. While I would never forego the heater for gas mileage myself, using the heater does slow the warm up process too.

If they're using a reformulated gas in your area, you lose mileage too.

And last but not least, have you checked your tire pressure recently? The TPMS will tell you when you are dangerously low, but it won't tell you when you're losing mileage from being just a bit too low.

lil' IS300

thanks for all the input guys..most of my trips are filled with lots of stop and go traffic with my car hardly getting heated. i do park in a heated garage so that helps a little.
about the tire pressure what should they be? I am running 18's with summer tires if that makes a difference
btw i just checked my avg and its 14.1

lobuxracer

iTrader: (2)

Check the sticker in the door jamb. It should say 35 psi front and 37 psi rear. You want to check the pressure before you drive very far. Ideally before you drive at all. The tires will heat up, even on cold days, and raise the pressure.

widlfiresd

15MPG for an IS?

You mean to tell me the LS 460 is getting better mileage than an IS?

Incredible.

NovaIS350

make sure you reset your avg after ever refill...I drive in the city as well, and get similar MPG. You may not be pushing your car hard, but you do drive a little over the speed limit don't you?

ToothDoc

It's cold now and I get about 4 mpg less than in the summer (21 vs. 17 mpg) and my average speed per commute is 40mph!

Fleainat

i get about 17 mpg pretty consistently. i drive about 14 miles each way in some traffic, but yea, if you use the power in the is350 even some of the time, you will not get the greatest mileage. but it's totally worth it! my last car was an 05 S2000 (4 cyl.) and i got about the same mileage (manual 6 spd, much lighter wt., etc.), so i think the is350 is relatively pretty good

Ericm

Here is a photo of my instrument cluster. This is a 241 mile round trip (mostly freeway) to Los Angeles I averaged 30.5 MPG with the cruise set at 80mph. I doubt the IS350 would be able to get better mileage than this at the same speeds.

KMRIS350

I get 23-25 around town and almost 29-30 hwy..

btw- I drive my car hard all of the time!

Ramon

Unless you have a special IS350 that no one else has, you're not going to get 30mpg while drive it hard all the time, it's just not going to happen.

KMRIS350

what ever dude! Ill take a picture next time...I drive 88-100 miles every Wed and Friday this is from Chandler to Tucson Arizona to race and I get 29-30 when I drive 70-75 cruz...FACT!

Shoot....I can drive it as hard as I want all day long around town racing Hondas and still get 24mpg...

KMRIS350

are you guys resetting the computer after filling up the tank?