Quote:
Originally Posted by Deslock
I disagree... even if it's not floored or run to redline, different tuning still affects MPG.
I forgot to mention that the Miata's gearing (assuming it's shorter) will also hinder its MPG.
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Different tuning only affects high load and high rpm operation assuming they already optimized the rest of the map, and the EPA does not floor it in tests. In real life when you do sometimes step pretty hard on the pedal, yes it affects fuel economy, but it doesn't come up in a test where they don't use the extra power.
Remember, this is the OEM we're talking about. They do their tunes very precisely, and they don't just add fuel everywhere the way some aftermarket tuners will, because they need to meet regulations. You don't add fuel when the engine still has some extra go in it. Throttle by wire lets you control this precisely.