Originally Posted by Slust

So I can only offer a small data set. Thinking maybe we can have a central thread so people state what they are getting in the different modes. State what your typical driving pattern is like (thick traffic, lots of short trips, little traffic and long trips, mixed freeway and city, mostly highway, etc.).

Where you live makes a HUGE difference. For example when I lived in NoVA/D.C. with my previous car it got around 14-18mpg. When I moved here it went to 24-27mpg.

So far with the IS350 I've gotten 22-24mpg, mostly 22.4mpg. I would say 50/50 or 60/40 mixed freeway and city driving. I do hit a lot of traffic but it is nothing like LA or DC traffic. In fact, when I first moved here I didn't even recognize it as traffic ...but it is still stop and go during peak traffic hours.

ECO Mode (full tank)
Gauge says: 21.5mpg
Manual calc: 22.2mpg

Normal Mode (full tank)
Gauge says: 21.7mpg
Manual calc: 22.4mpg

Best was 24.0mpg - first tank - Normal, drove rather wimpy.

Normal Mode (With a few Sport/Sport+ outbursts)
Gauge says: 21.7mpg
Manual calc: 22.4mpg

Normal Mode (With a couple Sport/Sport+ outbursts)
Gauge says: 22.7mpg
Manual calc: 23.3mpg

Sport Mode (full tank)
Gauge says: 23.0mpg ...so far (seriously doubt it will last lol )
Manual calc: ???mpg

I know we didn't buy our cars to be Prius v2 drivers but I think most of us would like decent gas mileage to go with our performance. I tried ECO mode on a couple tanks and I'm just not seeing any value with it. Normal mode actually gives me better gas mileage. I'm really hesitant to try a full tank on Sport because I know this engine is hungry and not fuel efficient, but that is my current test ...a full tank on Sport. So far the gauge is reading 23.0mpg but it's early in the tank. I'm not driving super aggressive but I'm not holding back either. If someone is driving slow I'm passing them because well... this car is super fun on Sport and there is a lot less throttle response lag in Sport.

I took someone's word here that Sport/Sport+ is limited to the first 6 gears but it went into 7th gear when I got around 70mph. So maybe when you hit high 80s you get to 8th gear, will have to play around with that. One thing I did find interesting is that even though you are in 7th gear the engine is still at 2.6-2.7k RPM. The picture is blurry because the road isn't smooth so trying to hold the camera straight is really hard.

Should be interesting to see how far Sport will drop my mpg. I think UncleSpud drives in nothing but Sport+ mode so maybe he can chime in.

Originally Posted by WWM

I don't think the fact that you have to press the gas pedal harder in Eco mode makes it worse than normal mode. I'm not entirely sure how it works, but when you press the accelerator does that not determine how much torque/power to apply and thus how much gas is used? All Eco mode does is provide less torque/power for a given pressure on the accelerator. So yes you have to press the accelerator harder than in normal mode to get an equivalent amount of torque/power but it's still the same amount of gas being used up. I think the idea behind Eco mode is to make it harder to accidentally apply too much torque/power than is required. which wastes fuel. It could perhaps have the opposite effect, ie. since the throttle sensitivity is so slight, that people are over-doing it when they try to accelerate fast. That's just a matter of learning the feel of the accelerator in Eco mode though.

Originally Posted by dojoman

Please mention which cars you have 'cause it's impossible to get 22-23mpg with my 350 in S+ mode.

Originally Posted by kidfsport

I have a 350 Fsport and my daily commute is about 60 miles a day (back and forth) consisting of roughly 17 miles on the highway and the other 13 through the city with 0 traffic in the morning except for getting through the gate onto base and moderate traffic on my way home which is less highway because I pick up my kids on the way home consisting of city driving through back roads so gas mileage is still similar to highway due to very little stop and go, I've had my car for a month now and fill up every week, I drive it primarily on ECO (just started pushing it in Sport S+ recently) and i have averaged 23-23.5 mpg a tank getting roughly 380 miles out of a tank. Hope this helps.

Originally Posted by smardav

You keep saying "here", but you never mentioned where. I'm glad you get better mileage "here" than NoVA/DC

Originally Posted by smardav

I have IS250 F-Sport. Here are my consumption:
1. 80% hwy driving around 55 mph: 35.1 mpg
2. 80% hwy driving around 65 mph: 30.5 mpg
3. 80% hwy driving around 75 mph : 28.3 mpg
4. 50% hwy driving: 25.7 mpg
5. 40% hwy driving: 24.4 mpg
6. 20% hwy driving and nasty stop & go Houston traffic: 21.5 mpg

All were on normal mode. Eco mode is useless I think. And I don't see the need to continuously use Sport mode, so......

Originally Posted by WWM

People say this a lot but that's losing sight of the fact that the base fuel economy ratings for cars are quite different. Yes, you could cane an economy box and get 15mpg, which is what I used to average in my C63. But if you cane a C63, you get 7mpg. On the other hand, if you mean that people shouldn't expect to get anywhere near to the car's official economy rating if they're constantly driving it hard, I agree completely. I don't even understand that anyway. I love opening it up as much as anyone, but most of my driving is commuting in traffic where I can't do that. In those situations I try to drive as economically as possible. I've been getting 12-13L/100km per tank the last couple of months. Brutally cold weather and less highway driving, probably only 20% now. Morning commutes are especially bad due to the lower temperatures in the morning and longer time between trips. I've been getting 15-16L/100km on my morning commutes This is driving 99.9% normal mode.

Originally Posted by 343P005

I'm in Toronto and have also been getting 15-16 L/100km. I thought it was hat me as I was expecting much better fuel economy vs what I am getting.