In one sentence, describe what the following article is about: Engines designed to run on diesel fuel operate differently than those designed to run on regular gasoline.  Diesel engines do not use spark plugs, and instead rely on the compression of the air and fuel to ignite the mixture alone.  Because of this, diesel fuel is less stable and cannot be used in engines designed for gasoline.  Diesel vehicles usually have clear “diesel only” markings on the inside of their fuel doors, and traditional gas pumps won’t fit in their filler necks.  Diesel fuel usually comes in only one grade, so there are no options to choose from. If you aren’t sure if your vehicle operates on diesel fuel, refer to the owner’s manual or manufacturer’s website. Every time you pull up to the pump, you’re presented with a few different options for the octane rating in the gas you put into your engine.  Most places offer 87, 89, and 91 octane fuel, while some locations may offer higher octane options at the same or separate pumps.  This rating is a measure of the stability of the fuel under compression.  Higher octane fuels are more stable and less likely to pre-detonate before the spark plug ignites the air/fuel mixture.  Pre-detonation (sometimes called “pinging”) can cause serious damage to your engine.  Engines with higher compression ratios require a higher octane fuel to ensure their air/fuel mixture doesn’t pre-detonate. Most car makers design their engines with a specific octane fuel in mind. Higher octane doesn’t necessarily mean better performance.  High performance engines often require a higher octane fuel because they utilize much higher compression ratios than most vehicles.  The compression ratio is the comparison between the volume of air and fuel that can fit into a cylinder with the piston in the down position and the same volume when the piston is in the up position (or when the air and fuel are compressed).  Lower compression engines do not require a high octane fuel and often won’t benefit from its use.  You can get the best performance, mileage and emissions under normal driving conditions from using the octane fuel your engine was designed for, not the highest octane available. The octane rating an engine requires has much more to do with its design than it does with its performance. Every engine is designed with a specific octane rating in mind, so the easiest way to know what kind of fuel to use in your car is to refer to the factory owner’s manual.  Many economy cars are designed to run best using 87 octane fuel because the automakers understand that a person shopping for an economy car would likely also prefer to use less expensive fuel, while many higher end cars may specifically state that you should use 91 octane.  Make sure to use the octane rating specified for your vehicle in order to keep your engine running properly.  Some cars will state the required octane rating on your dash board near the fuel gauge. Cars that require 91 octane often have a reminder printed on the inside of the fuel cap to ensure you use the proper rated fuel. If you purchased your vehicle used without an owner’s manual or you’ve misplaced it, you can often find the required octane rating for your vehicle on the automaker’s website.  If you are having difficulty locating it, try a simple search query such as, “what is the correct octane fuel for a 1998 Volkswagen Jetta?”  Only trust information you find on reputable websites such as the official site for the automaker. Do not trust information about fuel types you should use that you find on blogs or in forums.
Summary: Use diesel fuel if your vehicle is designed for it. Understand what an octane rating means. Don’t assume higher octane improves performance. Check in your vehicle’s owner’s manual. Check the automaker’s website.

Add any new skills and experience you’ve gained at your current job.  Having a resume that is current will give you confidence that you can move forward quickly if you do happen to lose our job.  Knowing that you’re prepared will take some of the fear of the unknown away from being fired. Send out your resume discreetly.  You don’t want you current employers to know that you’re searching for another job. If your job has a severance package, see how much your job will pay you in the event that you are terminated.  Knowing that you have a little money coming your way while you look for another job will give you a little breathing room. Severance packages can be worth as much as six months pay. Unemployment pay can help you get through the transition period while you’re looking for another job.  See if you meet the requirements to collect unemployment in your state.  Usually, you have to be unemployed by no fault of your own.  If you quit your job or are fired for gross negligence, you will not qualify. In most states, you have to have worked at least half the year before to collect unemployment. Before you leave your job, make sure to get plenty of references that will help you secure a new job.  You’ll need people to vouch for your work ethic.  It’s also a good idea to keep up a relationship with your references by contacting them every once in awhile by email or a phone call. You want to make sure your references remember you so they’ll be more likely to give a glowing appraisal of your work to future employers. Put yourself in a position to be recruited by head hunters from other companies.  Contact the human resource departments of other companies in your field to see what positions they need filled.  Let them know that you’re searching for a new job. Don’t let your current employer know that you’re seeking out other jobs.
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One-sentence summary -- Update your resume. Look through your contract. Look for unemployment benefits. Get references. Make yourself available.

Problem: Article: If you’re wearing yoga pants to work, you want them to be durable while also providing comfort. Try to find yoga pants made of a thicker material, and try them on before purchasing them to ensure they aren’t see-through. Sheer yoga pants are definitely something to avoid in the workplace.  Yoga leggings offer the most outfit options and tend to look the best in a professional work environment. Yoga pants with a slightly flared leg can also work, just make sure they are not baggy. While you may love your yoga pants, you don’t want them to stand out at work. Black gives off a more professional look and will go with almost any outfit, and brown, navy, gray, cream, and burgundy are also options that will look professional.  Subtle jewel tones, such as a dark green or dark violet can be appropriate. Avoid bright or neon yoga pants, as well as printed or patterned ones. This is one of the most important parts about wearing yoga pants to work and the key to an appropriate outfit. Wear long shirts or sweaters that go past your bottom, or even opt for a dress over your pants. Wearing longer tops will ensure you look professional and work-appropriate. You shouldn't be wearing the same yoga pants to work that you just worked out in at the gym. Not only do you not want to be wearing smelly clothing at work, but you want to preserve the quality of your work yoga pants. To do this, make sure you have separate yoga pants for work and the gym. To make sure your look remains professional, you don’t want people to be able to see the logos on your yoga pants. Logos, as well as any colorful side stripes, give off an athletic vibe that doesn’t fit in the office. Most logos are on the waistband of your yoga pants, making them easy to cover up with a long shirt or dress. To successfully pull off wearing yoga pants to work, you need to wear stylish tops that will balance out your pants. Try to create outfits that look professional while still being comfortable. Just because you’re wearing yoga pants doesn’t mean you should throw on some sneakers and a tank top.  A cinched button-down or flowy blouse looks great with yoga pants. Use jewelry and other accessories to take your outfit to the next level.
Summary:
Invest in high-quality yoga pants. Choose neutral-colored pants for a more professional look. Wear tops that go past your bottom. Separate your workout pants from your work pants. Keep all logos hidden. Dress your yoga pants up, not down.