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Grand Prix Challenge cheats / Grand Prix Challenge hints / Grand Prix Challenge faqs / Grand Prix Challenge solutions Grand Prix Challenge hints Slipstreams Trailing behind other vehicles slipstreams creates a high-speed vacuum which reduces fuel use and can increase speed by 5 mph. Other Grand Prix Challenge cheats hints faqs solutions: 2. Grand Prix Challenge hints 3. Grand Prix Challenge hints 4. Grand Prix Challenge hints 5. Grand Prix Challenge hints 6. Grand Prix Challenge hints 7. Grand Prix Challenge hints |