Cost for a tune up

Hello, what is a "tune up" to you? There really is no such thing these days. Vehicles have maintenance schedules to follow dictating needed services at approximate mileages. I'd recommend building a solid relationship with a local shop near you who can help you with the "needs" versus "recommended" items your vehicle could use. Using "a lot of gas" - could be normal operation for some kind of issue, but most issues present would also set the check engine warning light on. Is this happening? Good luck!