Common mileage boosters include replacing fuel filter, rotating tires and checking air pressure, adding fuel injector cleaner, installing new spark plugs, checking timing, replacing removable cover with a lighter cover or removing it comletely, disengaging front hubs, replacing timing chain, replacing PCV valve and making sure there are no leaks where it enters engine.

IF IT IS EQUIPPED WITH A CLUTCH FAN, REPLACE IT WITH A FLEX FAN (CHEAPEST) OR BETTER YET A FLEX-O-LITE ELECTRIC FAN. REPLACE THE STOCK EXHAUST MANIFOLDS WITH A SET OF HEADERS. THESE TWO ITEMS WILL NET YOU A 15 TO 20% INCREASE IN GAS MILEAGE. CORRECT TIRE INFLATION IS A BIGGIE. HERE'S THE EASY FORMULA. 1 PSI = 2 % LESS MILEAGE. IF IT CALLS FOR 35 PSI AND YOUR AT 32 PSI, YOUR LOSING 6% OF YOUR GAS MILEAGE. INFLATE YOUR TIRES TO THE CORRECT PSI, WHEN THEY ARE DEAD COLD. A MANIFOLD VACUUM GAUGE, MOUNTED INSIDE THE DRIVERS AREA SOMEWHERE, IS A DIRECT GAS MILEAGE INDICATER. THE LOWER THE READING THE WORSE THE MILEAGE. YOU WILL BE AMAZED HOW THIS DEVICE, IF USED CORRECTLY, WILL INCREASE YOU MILEAGE BY JUST SHOWING THE INSTANT READOUT YOU NEED, TO MONITER, MINUTE BY MINUTE, YOUR FUEL USAGE. GOOD LUCK.

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Q: What are some of the best methods for improving mileage for an 87 Toyota 4Runner?

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The EPA mileage estimate for the 2008 Toyota 4Runner is 16 mpg in the city, 21 mpg on the highway.

The EPA mileage estimate for the 2007 Toyota 4Runner is 16 mpg in the city, 21 mpg on the highway.

The EPA mileage estimate for the 2009 Toyota 4Runner is 16 mpg in the city, 21 mpg on the highway.

The EPA mileage estimate for the 2011 Toyota 4Runner is 17 mpg in the city, 23 mpg on the highway.

The EPA mileage estimate for the 2001 Toyota 4Runner is 16 mpg in the city, 19 mpg on the highway.

The EPA mileage estimate for the 2005 Toyota 4Runner is 16 mpg in the city, 20 mpg on the highway.

The EPA mileage estimate for the 2013 Toyota 4Runner is 17 mpg in the city, 22 mpg on the highway.

The EPA mileage estimate for the 2006 Toyota 4Runner is 16 mpg in the city, 20 mpg on the highway.

The EPA mileage estimate for the 2002 Toyota 4Runner is 15 mpg in the city, 18 mpg on the highway.

The EPA mileage estimate for the 2012 Toyota 4Runner is 17 mpg in the city, 23 mpg on the highway.

The EPA mileage estimate for the 2010 Toyota 4Runner is 18 mpg in the city, 23 mpg on the highway.

The EPA mileage estimate for the 2004 Toyota 4Runner is 16 mpg in the city, 20 mpg on the highway.

The EPA mileage estimate for the 2014 Toyota 4Runner is 17 mpg in the city, 23 mpg on the highway.

The EPA mileage estimate for the 2003 Toyota 4Runner is 16 mpg in the city, 20 mpg on the highway.

Buy a smaller car. You own a truck it gets good mpg for a truck. Make sure tires are correct pressure and do not carry any extra weight, i.e. passengers or luggage.

A 1991 Toyota 4runner is bigger than a 1990 4runner

21 MPH depending on how you drive.

The 2013 Toyota 4Runner has 24 valves.

The 2001 Toyota 4Runner has a V6 engine.

The 2011 Toyota 4Runner has a V6 engine.

The 2012 Toyota 4Runner has 24 valves.

The 2001 Toyota 4Runner has 24 valves.

The 2004 Toyota 4Runner has 24 valves.

The 2011 Toyota 4Runner has 24 valves.

The 2009 Toyota 4Runner has 24 valves.