there is truth to that statement.
I have an '00 & the stock ecu runs very rich, my best highway was 23mpg. Since going turbo/ SC and being tuned on AEM EMS w/ O2 feedback my city has been 21-23mpg & my best hwy was 29mpg. Of course I can do a lot worse than that if I try but still with a mix of some boosted & normal driving I get better mpg boosted than stock

OP get Injector dynamics injectors, I started with RC750's and my mileage actually got worse than stock due to the pig rich idle you have to run.. ID's idle nice & lean like they should.
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...I get 30mpg on a tank just driving around town with my stock ecu. With the comptech untuned i'm getting 23-24mpg around town. I'll have a tune and aem soon so we'll see, i still don't think there is any way to beat stock mileage when your dumping more fuel with larger injectors
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I got better mileage turbod/tuned/id1ks than stock.

Your larger (good brand) injectors aren't dumping more fuel than stock unless you are making more power than stock. So for the times you are getting on it, you are getting worse mileage, but the rest of the time you are getting better mileage.


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Precisely, just because you've got larger injectors doesn't mean they're always pouring more fuel in. IN FACT, some injectors could be more efficient, example they could spray a finer mist that atomizes better in the chamber thus boosting volumetric efficiency and as a result.... gas mileage. Even if the injectors are just equal then it's just the way DFW described, only using more fuel when you're producing more hp.

 

so an update went on a 400 mile trip and flat highway driving without a strong head wind and top up ac off got me 28.8 mpg 130 divided by 4.5 thats probably the best i can get speed was 65-70mph