There is no correlation between brake switch and mpg. The only possibility is that you have a mechanical brake pedal problem which is holding hydraulic pressure on the brakes causing drag and a loss of mpg.
SOURCE: How do I change the back brake light of a Hyundai Elantra?
If it is the light in the rear window, there are two plastic caps on either side on the base of the light. Pop off the cap and remove the screws inside. That should allow you to get to the bulb. I went to autozone for the bulb w/o removing it and they gave me the wrong one. If you have the bulb removed, you're better off, if not, the people at advanced got me the correct one without any issues. If it's the brake lights on the back of the trunk, you access those from inside the trunk. On either side, there are thumbscrews (sometimes under the fabric lining flaps). Once you remove the bulb carrier, you'll know which one is out. It usually lines up with the red cover but if you can borrow someone's time, have them look in your trunk at the bulbs as you test your parking lights to see which one lights and which one doesn't. Hope this helps.
SOURCE: oil change procedure on a 2005 Hyundai elantra
it is very easy to change the oil put the car on ramps secure the back end look for the drain plug underneath the engine make sure you have the right size wrench and when you remove the plug also check the gasket on the plug to make sure it is not cracked you will also need an oil filter wrench and my other suggestion to you is to go to autozone to see if they have a Haynes repair manual for your car and if they don't see if they can order you one in the mean time they can also print you off a diagram of how to change the oil in you car safely
SOURCE: change brake light switch
The switch is located under the drivers side dash behind the brake peddle arm.
SOURCE: change tke hood realase cable in hyundai elantra
Service and Repair Notes HOOD LATCH CABLE REPLACEMENT Remove the following items: Hood release handle. Radiator guard. Hood latch. Wheel guard. Using a clip remover, detach the clips from the body, then remove the hood latch cable (A) from the vehicle. NOTE: Take care not to bend the cable. Installation is the reverse of removal. NOTE: Make sure the hood latch cable is connected properly. Replace any damaged clips.
SOURCE: 2001 elantra master power window switch
at the bottom and top of the switch there are retaining tabs. you can try to pop it out at those points with a flathead screw driver, but it is sometimes easier to just remove the door panel to get it out.
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