There’s no one definitive answer to this question - but there are a few things you can do to make your gravity car more efficient and fun. One option is to increase the power of your engine. This can be done by adding more horsepower or by upgrading your engine software. Another option is to add more weight to your car - this can be done by adding more pounds of metal or plastic, or by investing in a heavier vehicle. Finally, you can try out different driving techniques - such as using a higher gear ratio or using a smaller diameter wheel. These techniques will help you achieve better performance and make the experience more fun.