: 8 years and 4,778.045 gallons



Andringa
06-26-13, 01:33 AM
So I saw this pic on another forum I read and thought it was funny. Got me thinking about and updating my mileage info for my CTS-V
http://24.media.tumblr.com/tumblr_m3kf6uNICW1r90ev0o1_1280.jpg

When I bought my 2004 CTS-V it came with a notebook of every time the original owner put gasoline in it. I figured "What the hell, why not" and have continued to keep records since I bought it in 2009.

Since delivery in April of 2005 my car has:
-Driven 81,475 miles.
-Made 399 stops at the gas station.
-Consumed 4,778.045 gallons of 91 octane gasoline
-Which is an average mileage of 17.02 Miles per Gallon
-That gasoline cost a grand total of $15,343.67
-Maximum observed gas mileage 27.55 Miles per Gallon (Straight Highway)
-Minimum observed gas mileage 77 Miles @ 6.13 Miles per Gallon (Brainerd International Raceway)

The original owner appears to have gotten significantly better mileage than me... Want to guess when I bought it?
https://lh6.googleusercontent.com/-rxCuWh96Xiw/UcpwBZx_jrI/AAAAAAAABEI/eM-iZ5XI8mA/w1039-h629-no/Mileage.jpg
Apparently he also changed the oil every 2500 miles, I've been going off of the computer Oil Life Monitor.
https://lh5.googleusercontent.com/-po10lE0Joz4/UcpwBfFjtNI/AAAAAAAABEE/a3rzmk-EvA0/w1037-h464-no/Oil+Changes.jpg
Each year is pretty much the same, lots of travel in June/July with a lot less winter miles. I think the original owner parked it in the winter.
https://lh6.googleusercontent.com/-JaOinvCbNx8/UcpwBSCpaQI/AAAAAAAABEA/SD5Hyr2W508/w1099-h544-no/Miles+by+year.jpg

And for added fun a GIF I made.
https://lh4.googleusercontent.com/-mT_mzMTXsUI/UaLRrHEQSWI/AAAAAAAABDc/BvakDkfjVaQ/w568-h320-no/donuts.gif

https://lh4.googleusercontent.com/-mT_mzMTXsUI/UaLRrHEQSWI/AAAAAAAABDc/BvakDkfjVaQ/w568-h320-no/donuts.gif

Famous556
06-26-13, 01:43 AM
Awesome. I would have done the same thing keeping the records going. That mileage at the racetrack is funny.

ETA: I didn't see the pictures at first. Those plots are really interesting. You've still got him beat on highest mileage though.

Andringa
06-26-13, 02:25 AM
Yeah, I had to fix the pictures, so they weren't up at first.

That 27.55mpg seemed a bit high so I double checked. I had a data entry error, which means the all time high is 25.69mpg, my best is my last fill up after 198miles of highway @ 70-74mph = 23.7mpg

UnsafeAtAnySpd
06-26-13, 02:33 AM
That's awesome. I'm horrible about keeping receipts or logging anything. I wish I had that kind of info for my car. I've hit around 28 miles per gallon a few times, but normally average around 25 on the highway.

----------

I had to copy paste the GIF URL to get it to work, so for anyone else it's not working for, do that.

Andringa
06-26-13, 02:44 AM
No idea what is going on with the GIF, it works in my Firefox and IE for me.

I added a link under the embedded version, maybe people can click on that instead of copy/paste.

thebigjimsho
06-26-13, 01:42 PM
The highest mpg I ever got was 27.8 on my '04 heading east on I-40 in New Mexico.

The lowest I ever got was 4.5mpg at Putnam Park.

And it's Brainerd.

Andringa
06-26-13, 04:44 PM
The highest mpg I ever got was 27.8 on my '04 heading east on I-40 in New Mexico.

The lowest I ever got was 4.5mpg at Putnam Park.

And it's Brainerd.

27.8 is pretty impressive, do you remember how fast you were going on that trip? Based on the instantaneous read out it seems like you should be able to get close to 29-30 at 55mph. I've never had the patience to do a longer trip sitting at 55mph to see what the mileage would actually be.

Right you are about it being Brainerd vs Brainard. I edited my post just for you.

thebigjimsho
06-26-13, 05:38 PM
Hahaha.

Actually, we were doing a constant 80 when I got 27.8. However, we had a tailwind and were on a constant downhill from the high altitudes of NM, heading towards Texas.

Earlier, we did 25-26 on a stint where we were in a convoy nearing 90mph...

rand49er
06-27-13, 10:16 AM
Very interesting graphs. Wow ... over 15 Gs for gasoline!

Not only is your MPG less than the previous owner, you're not quite as consistent about changing oil.

Thanks for posting!

Andringa
06-27-13, 11:08 AM
Yeah the total fuel cost kind of surprised me. Almost $0.19/mile on average. Crazy to think that every 5 mile trip is a dollar in the gas tank.

Oil Changes: It had been changed at the dealer immediately before I bought it, so I did the first one at 3000 miles. After that I've been going off of the OLM. Somewhere in the 0-20% left range. I've never ran at 0% for more than a day or so, but I've changed it early if I had a long trip or autox/hpde coming up.

Cadillac Cust Svc
06-27-13, 08:36 PM
Andringa,

I came across this thread and find your record keeping very interesting! Thanks for sharing!

Sarah (Assisting Laura)
Cadillac Customer Care

sssnake
06-28-13, 12:14 PM
With all of my mods I am getting an average of 28mpg at 70mph on the hwy. I was a little surprised to see others not doing as well.

Overd0s3
06-28-13, 01:00 PM
How do you guys get such good MPG? You must sit in the right lane doing 65mph...

thebigjimsho
06-30-13, 12:21 AM
I would get 25mpg all day long on the Interstate doing a minimum of 75mph...

carlson_mn
06-30-13, 04:56 AM
Cool info! Depending on the wind I get about 25.5mpg on the highway doing low 70s, assuming it is flat land and I keep the cruise on. A little better with a tailwind and worse with a headwind. Driving in higher elevation and in places that don't have ethanol in the gas will provide the outlier observations in the higher 20s, that's not too typical at interstate speeds.

BigDaddy-V
06-30-13, 08:27 AM
With cruise at 70 and a little tailwind I got just shy of 28 mpg with the fam and the trunk full! I was pleased! On average though I would say about 26.5 or so on the highway at 70.


BDV

Andringa
07-01-13, 05:28 PM
I'm surprised you guys get such good mileage, even just watching the instantaneous mileage it doesn't get much beyond 25 at 70mph.

I've had one Cat replaced, and the other one threw a code a few weeks back, I hope it's not causing issues. I suppose I could just need a tune as well.

carlson_mn
07-01-13, 11:42 PM
I'm surprised you guys get such good mileage, even just watching the instantaneous mileage it doesn't get much beyond 25 at 70mph.

I've had one Cat replaced, and the other one threw a code a few weeks back, I hope it's not causing issues. I suppose I could just need a tune as well.

Nah man, your car is doing what it should do at your elevation. 25 is about right, but you could have your upstream O2's checked if you think they are making it run rich. A tune shouldn't change your highway mpg as the car is in closed loop mode and engineered to run at 14.7, although I hear the Gen3 engines can be tuned for a leaner cruise, but not typically.

Andringa
07-02-13, 12:31 AM
Over the years I've read of people reporting 1-3mpg better highway mileage after a tune. Who knows how accurate those claims are though.

CTS4 V
07-02-13, 01:25 AM
This is very cool, thanks for sharing, I'm thoroughly enjoying it!

Andringa
07-02-13, 01:52 AM
I have a few other graphs that are kind of interesting.

Miles over time, you can clearly see that the original owner didn't drive it in the snow. Where as it has been my Daily Driver since I bought it in 2009.
122098

Apparently we have different habits for choosing when to get gas as well. I usually go down to the last tick mark on the gauge and then fill up completely. I'm not sure how he decided when to get gas.
122106
122114

rand49er
07-02-13, 01:39 PM
I have a few other graphs that are kind of interesting.

Miles over time, you can clearly see that the original owner didn't drive it in the snow. Where as it has been my Daily Driver since I bought it in 2009.
122098

Apparently we have different habits for choosing when to get gas as well. I usually go down to the last tick mark on the gauge and then fill up completely. I'm not sure how he decided when to get gas.
122106
122114Very interesting. Driving appears to pick up in June/July time frame and is reduced in early January each year.

Hammar
07-03-13, 01:34 PM
I'm not the only OCD data guy :)

131,480 miles
6822.5 gallons
$22,492.45 on fuel (I hide that column most of the time)...

19.3 mpg total/overall.
I did headers and a tune at 85k. gained ~ 0.7mpg average after that.
Adding the maggie (105k miles) didn't impact overall MPG at all, although a few tanks were surprisingly low at first...

Awesome thread Andringa :)

Hammar
Maggied 2005 V