Fuel light comes on 1-2 gallons before you go empty. This is true on just about all cars. Car makers deem us complete idiots, so they make sure we have at least 30 miles to go before telling us we're empty.

The type of oil you use can also affect your mileage. The recommended oil for Integras is 5w30. The reason this was chosen is because it gives us greater mileage. If you were to go to a thicker oil then it would result in a quieter smoother engine, but you lose out on economy. I don't quite remember where I read this but I'm gonna test it out this summer since you're supposed to use thicker oil when it's hot out anyway right?