Quote:
Originally Posted by Andyb04
No one is out to get you! Although some of these posts may not be polite or sympathetic...
Reducing the airflow restriction will increase your performance at wide open throttle, but just cruising it seems like the same amount of air would be going into the engine. It may be possible that you are entering a different BSFC region of your engine with this new configuration, or some other phenomena, although it's unlikely.
If you really want to, you may consider getting more data, including putting it back on and trying it again. My variation from tank to tank is about 5mpg even without changing anything on the car - driving mode, wind speed, temperature.. they all have a big impact.
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I always check my tanks' mileage even when I don't do a mod. It's just about the same considering I got this car to go back and forth to work only, but I do go on errands for my wife here and there in the "city" and that drops the mileage unforchantly. What can you do?