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Old 11-14-2012, 03:19 PM   #1
caveman05
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Default Stage 2 MPG

This is what my accessport read at the end of my 6 hour/395 mile highway drive! Mods include full cobb TBE, cobb intake+box and stage 2 reflash via accessport otherwise bone stock!

Figured id share for anyone out there considering a 'stage 2' upgrade and curious about gas mileage and what not.
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Old 11-14-2012, 03:29 PM   #2
drewvdw
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Yeah, that's not that surprising. I would regularly see 25-27mpg mixed driving when I just had a downpipe and intake.
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Old 11-14-2012, 03:30 PM   #3
the suicidal eggroll
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ECU-reported gas mileage is often crap. What was your actual gas mileage...you know, by filling up the tank and dividing miles traveled by fuel used?
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Old 11-14-2012, 03:36 PM   #4
Freep
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Doesn't matter what upgrades you have(Aside from huge injectors) if you are not in boost all the time you should see great MPG. The differences of the stock map and the stage maps only come into play when the engine is under high load or in boost. Otherwise the maps are almost identical so you should see the same mpg as your stock map.

People need to realize your MPG is your RIGHT FOOT.
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Old 11-14-2012, 03:36 PM   #5
Ian G.
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When my ecu says 21.9 mpg like it usually does, it really calculates out to closer to 19.5-20 most of the time. It's close but not 100 percent accurate
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Old 11-14-2012, 04:14 PM   #6
cmiovino
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Usually ECU readings like that are 1-3 MPG higher than they actually are. Given that, you probably got a good 26/27MPG.. which isn't too shabby.

I get 24 MPG all highway with a 4EAT and old tranny/diff fluid (which I'm changing soon).
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Old 11-14-2012, 04:24 PM   #7
801soap
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Nice
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Old 11-14-2012, 04:43 PM   #8
HinshawWRX
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Quote:
Originally Posted by the suicidal eggroll View Post
ECU-reported gas mileage is often crap. What was your actual gas mileage...you know, by filling up the tank and dividing miles traveled by fuel used?
By far the BEST method to figure MPG's. When we drove 15 hours I calculated after every fill up. I averaged 27.8 MPG on the 900 mile trip vs. the 31 that the AP was showing.
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Old 11-14-2012, 04:48 PM   #9
drewvdw
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Hinshaw is now a mod?!?! Oh god...
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Old 11-14-2012, 05:16 PM   #10
radd269
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Quote:
Originally Posted by HinshawWRX View Post
By far the BEST method to figure MPG's. When we drove 15 hours I calculated after every fill up. I averaged 27.8 MPG on the 900 mile trip vs. the 31 that the AP was showing.
Just curious, will someone get better gas mileage if you have an intake, or does it matter?

I've been stage 2 for about a month, no intake, just cobb exhaust and invidia catless, and the best I've seen is 22-24...
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Old 11-14-2012, 05:22 PM   #11
HinshawWRX
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Quote:
Originally Posted by drewvdw View Post
Hinshaw is now a mod?!?! Oh god...
I am upper management material.

Quote:
Originally Posted by radd269 View Post
Just curious, will someone get better gas mileage if you have an intake, or does it matter?

I've been stage 2 for about a month, no intake, just cobb exhaust and invidia catless, and the best I've seen is 22-24...
Intake will make no measurable difference in MPG. What will make a difference for long trips is flashing the economy map. (I forgot to mention my figures that I stated earlier were with an econo map flashed, but I'm not stage 2 so take it with a grain of salt)
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Old 11-14-2012, 05:24 PM   #12
HeroCrank
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Man you guys are good, I run torqued performance stage 2 and get 18-25 usually 20.5 combined. Nice job getting mid to upper 20's gentlemen
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Old 11-14-2012, 05:49 PM   #13
tunertype
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Every in car mpg estimater i've ever had has been off by a couple of mpgs. Its funny when people say they're getting x mileage and have never actually checked.
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Old 11-14-2012, 06:44 PM   #14
drewvdw
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Originally Posted by HinshawWRX View Post
I am upper management material.
Well, not really, you're lower management material...NOOB!!!
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Old 11-14-2012, 07:08 PM   #15
subarulz!
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So that's why he suddenly stopped being a little girl dog in the newbie section. Oh well his true colors will return I have no doubt.
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Old 11-14-2012, 11:22 PM   #16
SenorDucK
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Quote:
Originally Posted by caveman05
This is what my accessport read at the end of my 6 hour/395 mile highway drive! Mods include full cobb TBE, cobb intake+box and stage 2 reflash via accessport otherwise bone stock!

Figured id share for anyone out there considering a 'stage 2' upgrade and curious about gas mileage and what not.
nice. Cobb tune?
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Old 11-22-2012, 07:59 PM   #17
caveman05
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Yep, Cobb stage 2 off the shelf reflash. And regardless of the method that was used to determine the MPG, I'm still pretty happy to see fuel economy like that. I'll be taking the same drive either tomorrow or Saturday so ill be sure to calculate the gallon-mileage & divide method. It's also pretty surprising because I had cruise control set around 75-80 which is prime boost range in terms of RPM. Still happy tho!
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Old 11-23-2012, 01:32 AM   #18
JAMM0N
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I am going to check on my 60 mile drive to work on sunday. I filled up for aoat about 8 gallona for half a tank for about almost 30 dollars whixh isnt bad avg 20.7 per mile
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Old 11-23-2012, 07:10 PM   #19
guygettnby
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I'm stage 2 with a tp tune and I average around 20mpg.. Straight highway I will get anywhere between 25-28 mpg. But I drive like a old man most of the time. Most I have ever seen was 28.5 mpg and it didn't stay there.

The factory mpg gauge is not accurate. If you let your cat sit and warm up, your mpg gauge drops. I already calculate my mpg's at the pump.
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Old 11-23-2012, 08:40 PM   #20
BigRob74
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200 miles to a tank, tp stage 2 dp only. didnt buy the car for gas mileage. although on a long highway trip not being in boost i saw 27mpg
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Old 11-24-2012, 12:16 PM   #21
Elky
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Wouldn't some of the difference between the ecu vs pump mileage calculations have to do with the fact that the ecu does its math based off of injector duty cycle? Correct me if I'm wrong but wouldn't that be a more accurate metric than the pump which measures to 1/1000 of a gallon (which is 0.128 oz.)? Also I seem to recall a study saying that pumps are often off by up to 1/8 of a gallon per fill up.

Also does anyone know what degree of precision the Ecuador uses to monitor distsnce traveled? Making the assumption that since its a Japanese car and most of the world uses metric it could be safe to say that the car uses kilometers which would be measured at least to the tenth, which would be more accurate than tenth of a mile that you read off the dash.

Just a little food for thought when you see everyone saying how their calculations come in lower at the pump than what the system built into the car will display.

Also if you want to factor in bias, car companies want you to think your millage is better than it is, while gas stations want to wring as much cash out of your pockets as possible.

So if you've made it through my little castle of text the take away is this: I am really speaking out my ass but the truth is never cut and dry, even when it seems like simple division.

Tl;Dr: **** is complicated
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Old 11-24-2012, 04:46 PM   #22
the suicidal eggroll
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Quote:
Originally Posted by Elky View Post
Wouldn't some of the difference between the ecu vs pump mileage calculations have to do with the fact that the ecu does its math based off of injector duty cycle? Correct me if I'm wrong but wouldn't that be a more accurate metric than the pump which measures to 1/1000 of a gallon (which is 0.128 oz.)? Also I seem to recall a study saying that pumps are often off by up to 1/8 of a gallon per fill up.
Even with a 1/8 gallon error at the pump its FAR more accurate than the dash display. The dash display has been proven to be incredibly inaccurate by many people over the course of many years. Just a couple of months ago I filled up my bone stock '12 and hopped on the freeway. By the time I exited 15-20 miles later my mileage according to the dash display was over 34...and I was going uphill. My real mileage was closer to 27. A 1/8 gallon error out of 13 gallons is less than 1%, so if the calculation tells you it's 23, you might actually be at 23.2...I'll take that over the 20+% error on the dash display any day of the week.
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Old 11-25-2012, 09:11 AM   #23
ByeByeSRT8
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Nice. Looking to go stage 2 next week. Can't wait.
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