Milage report from my G8 GT

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Jul 7, 2009 | 03:56 AM

#16

teal98

Registered User

Joined: Jul 2001

Posts: 3,132

From: Santa Clara, CA

Quote:

Originally Posted by ADV1

I've got a Vector ECM and trans flash in my G8 GT and I'm averaging about 26-27 combined with a heavy foot and a trunk full of sales material.

I put on 1k miles on average/week and it's 2/3 hwy

Do you have to worry about warranty issues with the Vector ECM and trans flash?

How did the Vector change transmission behavior?

Jul 7, 2009 | 11:32 AM

#17

POS Camaro

Registered User

Joined: Aug 2000

Posts: 89

From: Groton, CT

Quote:

Originally Posted by routesixtysixer

Best I've seen so far (~1,500 miles) is 21.3 mpg tank. That's comparable, on average, with the 2007 335i (~22 mpg avg) I had previously and a bit better than the 04 A4 GTO (~20 mpg avg) previous to that. Of course, the GTO improved about 10% after a semi-custom DiabloSport tune. That car, in both driveability and economy, was significantly improved with a tune. I just did a Superchips Cortex tune on my G8 yesterday; will be interesting to see if I get a comparible post-tune mileage improvement.

I was talking about this post with the Suburban highway numbers. I figured that they would be a lot better than that.

Jul 7, 2009 | 12:16 PM

#18

CLEAN

Thread Starter

Registered User

Joined: Dec 2000

Posts: 2,574

From: Arlington, Texas

I think we were talking pure highway though. His 21.3 for a tankfull most certainly has some city in there. My city averaged about 16-17, but that's pure stop and go, no mile long cruises at 40mph.

Jul 7, 2009 | 02:22 PM

#19

POS Camaro

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Joined: Aug 2000

Posts: 89

From: Groton, CT

Fair enough. Pure city is about 10mpg. Mixed is about 14 to 15. It is about what you want/need. With 4 kids, a sedan won't work. A minivan didn't have a good enough mpg increase to keep it.

Jul 7, 2009 | 04:14 PM

#20

routesixtysixer

Registered User

Joined: Nov 2001

Posts: 669

From: Arcadia, OK

Quote:

Originally Posted by POS Camaro

I was talking about this post with the Suburban highway numbers. I figured that they would be a lot better than that.

Yeah, the 21.3 was just the latest tank and was about 60/40 highway/city. Keep in mind, as well, that with only 1,500 miles the L76 is probably not broken in yet, and may improve a bit after another 3 or 4,000 miles.

BTW, that was on 87 octane. I filled up with 91 after that tank and, based on what I have read, expect a small bump from premium fuel.

Jul 8, 2009 | 10:11 PM

#21

ADV1

Registered User

Joined: Mar 2003

Posts: 380

From: Gretna (Omaha), NE

It will void the warranty, this is why I ordered a separate ECM with the tune... That way I can swap back in the stocker in case I need service. The transmission is a separate issue... I'm taking my chances on that one. It does act a TON better than stock... they had issues when they first came out!

I'm over 45K on the Odometer and it's had no issues...