[GK13]

So, I really want to get the mileage up on my car. Is there anything I can do for it? I've maxed the air pressure in the tires. I drive REALLY conservatively. I do all the Eco driving possible. In neutral to slow down instead of brakes. All the small ticks I know. Do I need a cold air intake? Warm air intake? I have no idea how to do a grill block. How much of the radiator could I block? Is it even save doing that since there's no temp gauge? I'm kinda at a loss. It's a brand new car with under 1,000 miles so nothing should be dirty at all. Is there a certain spark plug that could help? Is there a tune for it where it can make the car run more efficient? Any ideas? I can't take the windshield wipers off or the antenna. Kinda unusable if I do. Tried it.