I thought maybe I was missing something there lol. 2.75 litres less is pretty decent. I gained around 2-3 mpg after I deleted mine.

 

Yeah I wasn't expecting single-digit L/100km fuel economy numbers after the deletes, but any improvement was nice to see. I bet if you crunched the numbers (and I have numbers) it would seem that it would take many months/kilometres/miles to actually break even in terms of money and time spent on doing the emissions deletes versus the money saved on fuel. There's the other train of thought which is that perhaps your truck may last longer and you may spend less on mechanical repairs down the road. Now reliability is very hard to quantify so when you hear people say that kind of stuff, sometimes it's just a justification to themselves or others.
Now for many of us here it's a bit more than just 'saving money on fuel' it's the associated fun that a performance tuner gets you which is why we spend the time and money to do this on our trucks. You know, the fun part. (Which is not saving money on fuel at all lol.)


The lie-o-meter did seem satisfied and showed lower numbers, although a convenient side effect of getting a performance tuner was able to correct the tire size so it could have affected these statistics slightly. Usually what wrecks my 'fill up' fuel economy (as calculated by the spreadsheet) is idling my truck, idling is getting me infinity L/100km during that time period that the vehicle is not moving.
Some basic controlled tests that I did showed that I actually get MORE fuel economy running the performance tuner on anything higher than stock power. However with that comes higher EGTs and higher turbo boost pressure which I was concerned about since I still have the stock turbo on this truck right now.



Here's my engine hour idle hour stats up to the end of September as well, kept track on another worksheet in the same workbook: