Some fuel stations have automatic air compressors that stop at a predetermined level. (For safety, double-check pressure with your own gauge, especially if another is suggesting you add a surprisingly large amount of air. ) Small permanently-installed valve-stem extensions can allow filling without removing the caps, but check that they are not prone to jamming with foreign matter and leaking. Recommended inflation pressures are for cold tires; it is best to inflate first thing in the morning or you’ve driven less than two miles so your reading will be accurate. If you have been driving around for a while or it is hot outside, add 3 PSI. Inflate to the pressure recommended by your car’s manual or the sticker on your driver-side doorpost. Be aware that the reading stamped on the tire is the maximum tire pressure, not the recommended.
Be sure you are keeping good spark plugs in the engine,[4] X Research source changing the oil on time,[5] X Trustworthy Source Consumer Reports Nonprofit organization dedicated to consumer advocacy and product testing Go to source making sure the air filter is clean, etc. [6] X Trustworthy Source FuelEconomy. gov Official source for the U. S. government for fuel economy information Go to source
If you find the engine is running at above 3000 R. P. M. s, it’s possible you’re accelerating at an unnecessarily a low gear. So, ease off the pedal and let the engine build up a higher speed at a lower RPM. he lower average RPM you travel the lower your work and this directly determines your gas mileage. How do you monitor your RPM? Most cars have a left gauge next to the speedometer called the tachometer. It measures your RPM at x1000 which means if your gauge indicates halfway between 2 & 3, you’re running at 2,500 RPM. A comfort/efficient RPM zone is between 2,000 and 3,000 RPM; however, try to stay below 2,000 as much as possible and not much over 2,700 unless necessary, such as when you are moving uphill through a traffic light from a stopped position. This means you won’t get above 40 mph (64 km/h) and you’ll achieve 50–55 mph (80–89 km/h) in the city and up to 65 mph (105 km/h) on the highway and still be running at 2,500 RPM. Try to find your comfort/efficient zone and perhaps you can get a few more M. P. G. s by watching how hard your engine is working! Be aware that some vehicles are monitored by x100.
