Black Bear Tune on my 2011 5.3L Tahoe

[Jmat]

Going back to the Mpg discussion on this thread, I recently took a road trip totaling over 700 miles. According to the DIC, my truck averaged 19.7Mpg running an 87/89 octane tune using 91 octane. I'm a bit surprised with this number, I honestly thought it would be lower especially since the truck was loaded with three adults and packed to the headliner with camping gear and supplies. Guess what I'm asking is, is the DIC accurate?

 

[2011Tahoe]

I do not believe the Dic is accurate, my boss and I both have 2011's, his is a silvy but both our computers read a little low. Mine was about 1.2mpgs low on last trip over 400 miles.

 

[felixgun]

So the DIC is showin less MPG's that you're actually getting?

 

[Goodinblack]

The DICs are mostly inaccurate simply because the ACTUAL gallons used is more than the REPORTED gallons used.

In other words........ If your DIC says you burned 20 gallons, you really burned about 21.5.

 

[MACHO]

Jmat, Based upon the 2 tanks I've ran thru it here's my math:

UPDATE: ran 2 tanks of 92 chevron thru it

DIC ended at 14.3 avg mpg.

Got 665 miles out of two tanks.

Assuming the same gas usage of 22.5 gallons on both fill-ups that puts it more around the 14.7 range.

So if you take that situation above, the DIC runs low.

However with Auto Start and long idling times that would go the other way...

Bottom line, I believe the varience between DIC vs. actual is going to be highly situational.

 

[73shark]

My experience w/ several GM trucks w/ a DIC mpg monitor is that it is always about 0.5-1.5 mpg high (optimistic) Best way to check is keep track of your gallons and miles and do the math yourself.

 

[ghoster]

My dic reported 19.5 over two tanks, when I calculated it manually it worked out to 20.5. That was on a trip, so no extra idling or remote starts.

 

[Jmat]

Thanks for your comments guys. Seems like depending on your truck, the DIC results could go from too optimistic to overly pesimistic and doing the math yourself is the best/1most accurate way to go. Fortunately or maybe unfortunately, I have a 1000 mile road trip,coming up. Looks like I'll be counting' miles & gallons.

 

[MACHO]

No prob bro. That's what I love about TYF. GM brethren helping each other out!

 

[2011Tahoe]

My dic reported 19.5 over two tanks, when I calculated it manually it worked out to 20.5. That was on a trip, so no extra idling or remote starts.

Mine was 18.5 on dic and actual was 19.7.