In the summer of 2004, Toyota sent a demo disc of GT4 along with the marketing brochure of its Prius hybrid car. The demo disc featured only two cars, namely the Prius and a Toyota hybrid concept sport car. Toyota stopped offering the demo discs when the requests of the marketing brochure became disproportional to the real interest on their cars. The disc became a collectible item for Prius owners and it was available via auction at eBay occasionally.

An advanced player will be able to judge his performance by the realistic lap times. According to the developers, a professional driver was invited to set times using the same car on the Nurburgring Nordschleife circuit, and the GT4 lap times were within 2% of the real life equivalent.

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