Fuel mileage tracker all over

[swathdiver]

39 minutes ago, tnchevy said:

I have tracked my mpg's since I bought the truck (hand calculated and put on a spreadsheet).  My truck's lifetime mpg's has been slowly decreasing in the 4 years I have owned it.  The first couple of years it was 19.5 mpg avg but now down to a lifetime of 19.1 mpg's.  I only drive 5-6k miles a year so I am just at 25k for the 4 years but still disappointing since every other vehicle I have ever owned got better mpg's after the engine was broke in.

I track mine too and also watched it come down, turned out to be the cats.

[Darmichar]

2 hours ago, tnchevy said:

I have tracked my mpg's since I bought the truck (hand calculated and put on a spreadsheet).  My truck's lifetime mpg's has been slowly decreasing in the 4 years I have owned it.  The first couple of years it was 19.5 mpg avg but now down to a lifetime of 19.1 mpg's.  I only drive 5-6k miles a year so I am just at 25k for the 4 years but still disappointing since every other vehicle I have ever owned got better mpg's after the engine was broke in.

My 2014 was the same way.  I assumed it was build-up on the valves from the GDI and just general wear and tear.  I planned on doing a plugs/wires etc. tune up in the fall to see if that helped  but dumped it for a 2018 instead.

[tnchevy]

I don't put a lot of miles on my truck due to taking a company truck home and preferring to be on 2 wheels on the weekends so gas mileage is not something I am too concerned about but still don't like that it is slowly going down.

[Sierra Dan]

4 minutes ago, tnchevy said:

I don't put a lot of miles on my truck due to taking a company truck home and preferring to be on 2 wheels on the weekends so gas mileage is not something I am too concerned about but still don't like that it is slowly going down.

What can cause this drop?

Anything related to AFM problems or gumming up of the valves?

[tnchevy]

Not sure but other factors can come into play like a colder than normal winter or higher percentage of in town driving than highway.  When ever I haul heavy loads or pull a trailer I don't put that tank of gas into my spreadsheet as to not skew the numbers to bad.  Could just be the nature of a DI engine but don't really know.

[Grumpy Bear]

I track every ounce of fuel I burn and every mile I drive in Excel. 75,000 miles now. No cherry picking. I find a 25 tank moving average gives a nice view of seasonal changes and the lifetime and running average a good view of general health. I also have a chart for every tank and their six point moving average. Better for showing changes in my habits and explaining weather and terrain.  Note: There is allot of noise early on just like your instant mileage numbers of your DIC. Even the life time averages can and will be tossed about a bit by large seasonal swings but in general my numbers continue to climb. I.E. As you can see the life time average has exceeded the running average for last year.  

 

[Darmichar]

That's my MPG chart for my 2014.  You can see an ever so slight decrease in general MPG over the life of the truck.

 

*EDIT* FYI - The grey lines peeking above the white lines are the MPG's reported by the DIC for that tank.

[swathdiver]

Boy, I better figure out how to make these fancy graphs!  My spreadsheets are full of numbers!

[Darmichar]

6 hours ago, swathdiver said:

Boy, I better figure out how to make these fancy graphs!  My spreadsheets are full of numbers!

I use Road Trip on iOS.  Nice app that I think I paid $4.99 for several years ago.  Well worth it.

[Grumpy Bear]

7 hours ago, swathdiver said:

Boy, I better figure out how to make these fancy graphs!  My spreadsheets are full of numbers!

I use Excel in Windows Office. 

[swathdiver]

17 hours ago, Grumpy Bear said:

I use Excel in Windows Office. 

Me too!  Almost an excel junkie, use it for all sorts of things, even drawing.