Went on a two week drive.
Short story:
14 states, 16 days, 92 hours in the car, 5,200 miles, 260 gallons of
gas.
1 visit to the ER, 1 backing into a pole, 1 speeding ticket, 1 fuel
delivery from OnStar, 5 flues (ending with mine today), 2 wasp attacks
with 4 victims.
But it was awesome and the kids were fantastic in the car (much to our
surprise). Some amazing country out there.
We didn't see rain or drive on wet pavement the entire trip out and all
but one hour coming back (near Denver). We had one thunderstorm in
Michigan for about an hour or two. The kids loved getting to actually
see lightning, they had only read about it in books before.

So, the DIC says 20MPG average, with a lot of mountains (crossing the Rockies, twice), seven people, 300lbs of luggage in an external carrier.

I checked the actual mileage over 800 miles of driving and two tanks, the DIC said 20.5MPG, the actual was 23.5MPG, through the Rockies!!! Awesome.

The fuel gauge calibration sucks. I need to have it serviced, as there is a TSB on this. There is a lot more fuel in the first 1/2 than in the second 1/2. The bottom 1/8th is 2 gallons, and it stops running in a couple of miles after hitting "E". So, we ran out once and almost a second time. OnStar saved us with a free 5 gallons of fuel delivered to us on Devil Dog road in BFE (well, BF New Mexico).

I made footrests for the middle row and the kids were very comfortable. If you don't do this, their feet don't touch the ground and they cannot be comfortable. This is how they did it in 1960s Cadillacs!

Oh, and for the idiots that change their oil every 3,000 miles because the oil companies tell them to, I changed it before we left, and after 5,200 miles, I have 62% life remaining. This was through mountains and a lot of 85 to 90 MPH driving. On the ER trip, I had it up to 120mph...

 

fj,
welcome back, seems like a nice trip, glad you enjoyed it
thanks for your feedback

 

not because anyone tells me to but cause its CHEAP insurance. Mobile 1 of course. I hvae had several cars over the years (actually QUITE A FEW) and I have never had any problems after adopting this practice. I had 2 Range Rovers with 150,000 to 200,000 k on them and they both ran like new. I also only use Chevron gas and have never had a fuel injector issue i any of my fuel injected cars.

 

I thought this vehicle was computer limited to 100mph. (as are most GM vehicles)

 

The advertised top speed is 118MPH, but it wasn't doing a good job limiting it to that speed. It had a ton more power on-tap, so it was powering hard as I was peaking a hill, then it shot past 120MPH on the downhill, but it was limiting (which explains that weird feeling of it, like running out of gas). The vehicle is limited by the tire speed rating, most definitely not power. I'm sure sanity has something to do with it, too.

 

I don't know of any GM vehicle built in the last 20-years limited to 100MPH. That is just silly. The Corvette is limited to 202MPH, but that is by physics, not GM.

 

Many trucks have speed limiters due to driveshaft speed. Plus, they handle like crap at speed due to the aero of a brick, esp. with anything on top. Also, most truck tires are S or T rated, so anything over 115 will exceed their capabilities.

Vette's got tire, aero, suspension, and drivetrain that can handle sustained 3 digit speeds. Trucks don't.

 

Google the term "GM speed limiter" and post back after you've done proper research please.