Quote:
Originally Posted by Spikuh
I would be very interested in some possible explanations for such an increase as well, but that may be something may be something Dyno would need to come in and explain.
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The engine is being made more efficient - it won't take as much fuel to make the same HP. Many ppl that get a tune are going to be driving harder after the tune and MPG will probably drop. If you drive the same after the tune, MPG should go up.
The same thing happens when you give an old points/carb setup a good tune - efficiency goes up and brings along more power/MPG (depending on how you drive).