Mine's back. I'll post after I drive it a bit.

 

Mine to. Nothing I can tell so far.

 

My Yukon seems to have not changed at all and is still performing flawlessly!

 

No problems, no worries, in and out in an hour (I had an afternoon appointment), drooled over the new camaro for about 45 min, and was home by 3:00pm. Took it for a short ride from Chula Vista to Escondido (Wil animal park), No problems whatsoever!!!!

 

It was a nice weekend at the Wild Animal Park! My AuPair drove it there, so I still don't know if it is different, but she said it ran perfectly. I'll probably get to drive it sometime this week. I just followed them into the park in my Cobalt to buy a new membership for her and the kids. It always seems to be 10 degrees cooler at the park entrance than at my house...

 

Ok,

1 Week after the upgrade, and I am noticing about 1.2 MPG increase.(I was getting 19.4 MPG in San Diego, now getting 20.6)

Of course traffic has been unreasonably light this week, so dunno i that has anything to do with it as well.

 

now that you mention it, I came back from a road trip 2 weeks ago and I haven't had to fill up yet....I am still running on the tank that I filled about 200 miles from home...! hummmm????

 

Well, I've put a few miles on it (~70) and a lot in-town. The instant-MPG meter is working differently. Less optimistic. Same terrain shows less time at 99mpg, yet the drive feels the same. I would say it probably indicates mpg quicker when switching from all-electric to hybrid mode. It seems to allow a slight bit more acceleration under electric power, before kicking in the gas engine. I just feel less-stressed trying to leave a light under electric power. Nothing scientific here, just seat of the pants.

It would be great to have a GM hybrid drivetrain guy on this site. It always helps when you don't have customers speculating...

 

Hi

I got a 2009 Yukon Hybrid manufactured 11/08 a few days ago with the recall still pending (it was a "certified used" never titled truck bought by the dealer at a GM Auction).

I took it for the recall and I complained to the service manager that no matter how slow I accelerated the ICE always would start at around 10MPH, which I thought was pretty slow for it to start.

The update took all day, not an hour as experienced by other people in this forum. I guess they haven't sold a lot of these at this dealer in Miami and still are not familiar with it. They told me that they had to call GM to get the procedure done.

After I got it back I was able to get up about 25MPH before the ICE started... seemed much better... I'm really looking forward to the MPG improvement over my Escalade ESV...

 

The mpg on my Tahoe has been going down since I picked it up less than two months ago. Only averaging 15-16 mpg now, at least it was 17-18 earlier. I'm taking it to the dealer again (it was there a month ago to check on errors I was receiving via OnStar). I asked them about the recall back then and they said the truck didn't need it. I assumed that it was taken care of before I bought it since it was relatively recent. Now, I'm not so sure. I'm having the same issue as apm, ICE typically comes on around 10 mph. I can get it to go to 20 mph once in a while, but I gotta be on completely flat road (or downhill) and feed little to no gas. Longest I've driven without ICE kicking in is less than a mile, mostly with a slight downgrade (right before my driveway), and I gotta be doing less than 20 mph. I don't think anyone on this board is getting worse mileage than me. Scary part is it seems to be getting WORSE.....