Hey all,

Will sport mode affect mpg?
(2009 MCSCm, Dallas, TX)

Thanks!

 

def will as the throttle body will be open more than in normal mode.

 

In sport mode the throttle goes to 11.

 

...

 

My 2¢...the funfactor is well worth the extra pennies. I NEVER drive without the sport button on in my 09 MCS and my average MPG is 33.8 and that's a good mix of city/freeway driving.

 

+1 and i run 18psi and average 33.xxmpg of course that's with the onboard cpu and not entirely accurate

 

Two weeks ago, I "deprogrammed" my autosport + button so the SPORT button would not be turned on automatically. After doing that, I have actually seen my gas mileage DROP from low/mid 30's to 28 and 29 (for each week using the distance travelled divided by gallons used formula). No significant changes to my commute, weather has varied slightly.

I'm going to reprogram it and fill the car back up this evening and check it again over the next couple off fills. Just after having the RMW tune put on back in April, I saw a high of 37mpg on our 9 hour trek to the Dragon...

 

Sport button will decrease your mileage... your throttle body is open fast and earlier allowing more air which = to more fuel. Simple as that, not taking away from the previous poster but its just simple.

 

No, the sport mode will not directly impact your mpg on a manual. It may indirectly as you may drive differently due to the different experience it creates.

 

No argument with your logic. In a week or two, I'll see if my MPG comes back up. If not, there's some other variable. If it does come back up, I'm going to assume that there's something between the ECU tune and the Sport button that makes it more efficient.

Here's a thought though. If the throttle body opens faster - making more power faster, then I would be lifting sooner as I get to speed faster. Same when I accelerate from cruising speed, my speed increases faster so that's less time on boost. When coming off throttle, does it close faster? Just a thought.

Mine is a manual with a CAI, DP Hot and Cold side piples and cat back exhaust.

I'll watch the mileage and reply back when I have a chance to check it.

 

For example: At 30% throttle in normal, the throttle body is open less than at 30% throttle in sport mode. The engine is receiving more air which equals more fuel to compensate.

 

I like your debate,

That is a good question but i think it would relate more to how well you could judge the balance between the two and how well you could adjust your Acceleration habits...

Most of your mpgs will come from driving habits, then you factor in mods and tune and other variables.

I am addressing the simple fact that sport on uses more fuel. Since the body opens sooner you get a bigger charge of air which requires more fuel.

Try this:

Put it in a higher gear like 3rd or 4th and while accellerating with moderate throttle say 50% take the car out of sport mode and you will physically feel the throttle body close as if "you lost some power".

I can feel this and also see it with the amount of vacuum produced and lost when sport is engaged under acceleration with no boost.

The MAF controls most of the fueling so if there's more air entering there will be more fuel.

 

I think you are confusing the position of the throttle pedal and the actual throttle body. The sport mode changes the mapping between the throttle pedal and the throttle body. It does not change anything about the throttle body itself. 30% open is 30% open no matter what the position of the throttle pedal is.

@cmc, my initial thought on your drop in mpg is because you have gotten used to the sport button always being on. With it now being off, you are sensing that you need to get on the throttle more in order to achieve a similar acceleration experience.

But if you change your throttle pedal position to adjust for the new mapping, you will be at the same opening in the throttle body (and hence, the same rate of fuel consumption).

 

in sport if you have the pedal depressed at 50% the throttle body will be open a lot further than if you depress the pedal at 50% out of sport mode.

thats what i just explained



** In the referred to post, "Throttle" was referring to pedal position, my mistake

@
But if you change your throttle pedal position to adjust for the new mapping, you will be at the same opening in the throttle body (and hence, the same rate of fuel consumption).


"i think it would relate more to how well you could judge the balance between the two and how well you could adjust your Acceleration habits..."

 

Hi there

I'm not a mechanic, but I have not really noticed a difference in the amount of gas used, and I drive sport mode in my 2010 Clubman all the time. The only time I did not use sport mode was for the initial break-in period after I bought her. I drive a mix of city/highway everyday. I have not taken the time to calculate mpg between fill-ups, but I can say that I do not need to fill up the tank any quicker now that I drive in sport mode. I was not able to get my Clubman with a manual transmission when I bought her, but I think that sport mode is just as much fun!

 

My arguement is simply that if you do not compensate for the change



the same driver driving the exact same way (using the same amount of pedal travel) will get less mpg with sport on than off.

 

I've been using sport mode all the time over the last 2 mos or so and I have not noticed a significant difference in my gas mileage, based on the onboard computer.

 

Sport mode doesn't necessarily cause a decrease in mileage. It might, but much depends on what you do after you let up on the gas. It's a bit counterintuitive, but what you do with the brake pedal has more effect on mpg than the accelerator.

Engines are actually fairly efficient when accelerating. The instantaneous mpg looks poor, but you are also storing a lot of energy in the vehicle's motion as you get up to speed. Take your foot off the gas and the mpg indicator jumps up to 99.9+ as you coast along getting all that stored energy back. Step on the brake, though, and that expensive stored energy turns into heat, as the brake pads rub the rotors. Heat = waste in this case.

Drive as if your brakes don't work and you will help maximize mpg, even if you tend toward those jackrabbit accelerations that the sport button encourages.

 

Well, your first two statements are inconsistent with your last statement. There is nothing about the sport mode itself that will cause a decrease in your mileage. How you drive (whether sport mode is on or off) is what impacts the gas mileage.

 

Someone has never seen this is spinal tap.

 

The 3 statements say the same thing

The last statement gets rid of the variables to state the fact:

Sport mode the throttle body will open further with less pedal travel

with a consistent foot you would receive less mileage.

 

either way im not an e-battler so thats my .02