Comparison of 87 performance vs 87 econ

Since this question has popped up several times. I decided to get an answer for everyone regarding the MPG difference between the performance tune and economy tune.

How I tested and tried to eliminate human factors as much as possible..

I took my son to a two week summer camp which is 474.7 miles round trip. I took the same route both trips, using cruise control set to the posted speed limit. I left at the same time in the morning to rule of differences in traffic and the tempature was within 5 degree on both days.

The trip with performance tune (no picture)
474.7 miles
12.5 mpg
37.9 gallons used (ran out of gas in the driveway, used 5 gallon jerry can to get to gas station)

A week before picking my son up I switched to economy tune, to allow time for it to settle in before test.

the trip with economy tune
474.7 miles
14.8 mpg
31.9 gallons used



Miles to empty 89 miles

So the difference between performance and economy tune is
15% improvement in range (474.7/563.7=85, 100-85=15%)
16% improvement in mpg (12.5/14.8=84, 100-84=16%)

wow thats pretty damn good!

What tuner and who's tune are you using?

Sorry... 5star tune and sct x3 tuner

-Greg

yup darn good. With 91 economy tune i can get down to as low at 15l/100km on the highway. the response is a bitch, and over taking someone already going 120 is a pain too but saves money. Im always on 91 agressive performance tune, i like to hit the pedal to the floor.... ALL THE TIME!!! with 91 performance i get as low as 22l/100km. Not too bad but HUGE difference in response and feel of the throttle. So passing people doing 120 already is a joke for me.

At posted speed limits I see a meaningful difference between 87 perf and 87 econ (which is consistent with Greg's experiment). Unfortunately at higher speeds the difference seems negligible. So I typically run in perf on my road trips now. Curious if anyone else has had similar results at higher speeds.

goin over the speed limit i saw about a 2 mpg increase from my 93 perf to my 93 econo. thats at about 80 mph for the most part

Yes, at higher speed there was NOT a noticable difference between performance and economy. I think the "fuel" economy difference between the tunes is negated by pushing the 3 ton barn door through the air. That is why I used the same route, same speed, and tried to do apple to apple comparison.

-Greg

I can't really add anything about a tuner, but my stock 2010 6.2 got 15.3 (hand calculated) over a 5600 mile road trip recently. Most highway runs were at 75/80mph.
I was running super (91/93 octane) the entire trip.

ya I just did round trip to joplin and notice really the speed is the factor, I drove down there at solid 70mph with 91perf tune and got 15.5 mpg(was very happy) and on way back did about 78-80ish and got about 13.5.