17% is about what you would expect when the temperature goes from 72F to 100F. Inlet temperature is also a major contributor to fuel efficiency. Hot air isn't a

17% is about what you would expect when the temperature goes from 72F to 100F. Inlet temperature is also a major contributor to fuel efficiency. Hot air isn't as dense so the ECU will add more fuel and retard timing to compensate to help cool the cylinder and avoid pre-detonation.