Our tunes are written according to each customers specifications and feedback. We do not believe in a 'one size fits all' approach. Whether you're looking to improve daily driving, enhance performance when towing, increase power for more fun, or maximize modifications and horsepower for a race, we have you covered! We support a wide range of fuel types with varying levels of flexibility. Our Auto-Octane fuel type supports all pump gas (87 Octane, 91 Octane, and 93 Octane), and supports up to 30% ethanol content. This is the most similar option we have to a flex fuel tune. Should you want to run a more performance-focused tune, you may prefer our 91 Octane fuel type which supports 91-93 octane fuel, or our 93 octane fuel which provides maximum gains but only supports 93 octane and up to 30% ethanol content (e30). Fuel types for higher ethanol contents, such as e50 and e85 are also available, depending on which vehicle you have. Some vehicles require additional modifications to the fuel system to run full e85.