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Actually Race Gas contains less energy (BTUs, Joules) than regular pump gas. This is because the octane boosters used contain less energy and replace a certain volume of what would otherwise be gasoline.
What it does do is allow changes in the CR, Spark curve, mechanical timing, etc. so that more energy is extracted than would be the case with pump gas. And, all this is dependent upon the fuel not pre-igniting or knocking which is where the octane boosters come into play. But, only if your engine is mechanically and electronically modified to make use of it.
There are very specially designed engines which produce much more power from pump gas - such as in Formula 1. But, these engines use exotic materials and technologies costing hundreds of thousands of $ and not available for a street car.
No doubt, the TT can make better use of this fuel than an NA car can. To accomplish this in an NA car, you're talking pistons, cams, DME flash, etc. to get any benefit from this fuel.
With any unmodified engine, using Racing Gas will decrease performance, unless the DME contains untapped maps which don't come into play on pump gas.
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