Q&A for How to Increase Fuel Mileage on a Car

You can expect a pretty good mileage, although usually the best mileage can be achieved at around 80km/h.

You can get probably about 26 MPG going 45-55 MPH while drafting roughly 50 feet behind a semi-truck and constantly moving. Otherwise, if you are in a city environment or cruise on the freeway at 80 MPH, you'll be lucky to get more than 18 MPG.

As mentioned, while driving what at what speed your RPM is low. The level of RPM at which the speed is more, but RPM is less, is the "Sweet Speed."

Turn the carburetor 3/4 turn clockwise, and tighten the fuel pump hose to adjust.

Strictly a sales gimmick, they don't do anything but some have even been found to do the opposite. Buyer beware.

Don't drive fast, check tires/oil/water regularly. Don't carry heavy unnecessary weight. A mechanic can fine tune your car so it's more prepared and efficient.

If the car doesn't have a miles-per-gallon gauge, reset your trip mileage odometer each time you fill up with gas. Note how many gallons you fill up with each time, and once that tank is empty, note the trip mileage on the odometer. Then just divide your trip mileage by the gallons you filled up with for that tank, to calculate your miles per gallon for that tank. (If you don't have a trip mileage option on your odometer, you can also just calculate the difference between the total mileage on your odometer between gas fill-ups.) Example: you fill up with 12 gallons, and drive 328 miles on that tank, so 328 / 12 = 27.3 miles per gallon. Try to keep track of which gasoline and types of driving make for the most efficient MPG.

You can improve your mileage at higher speeds by re-gearing the car, so you're at lower rpms at higher speeds. Also, newer cars can get better gas mileage.

Find out what has happened. Excess fuel usage could be as simple as a dirty air filter, bad timing (for older Kettering ignition system engines), or as bad as low compression of cylinders.

If you're thinking 30 or more miles per gallon, probably not. The best way to get the best possible economy is to have a correctly maintained and tuned engine, and keep the tire pressures up.

A fuel additive wont literally clean it, but it will increase fuel economy and horsepower.

It is best not to "coast" (if you mean throwing the transmission into neutral), it renders emergency maneuvers much more unpredictable. If that is not enough of a reason, newer fuel injected cars with an engine control module will cut fuel injection on their own once the car's momentum can maintain it above a certain rpm (say 1200( with your foot off the gas pedal. So it is dangerous AND it burns more gas to coast (on most newer fuel injected vehicles).

Use higher gears (smaller numerically) in differential or go to a taller tire. Keep the car tuned up and tires properly inflated and drive at a slower speed.

It depends on how you maintain your vehicle. I would say 100,000 in most cases for a 4 cylinder vehicle.

You should in fact transfer to a higher gear. This will give you better fuel efficiency.

A wheel nut brace and vehicle jack. I also carry assorted screwdrivers and a basic set of spanners, pliers, and cutters. It's also good to carry insulating tape and wire. Check your vehicle fuses and globes and carry suitable spares.