... It takes X amount of power to move gasoline engine vehicles from point to point. The engine converts gasoline to heat as the power source. Much more than fifty percent of the heat is wasted unused and is dissipated though the radiator and exhaust system. Large cubic displacement engines normally consume more fuel than smaller engines but this is not a ‘hard’ fact..

... Here is a list of a few of the mechanical things that can effect fuel mileage.

Cam and ignition timing, cam lift, duration and valve size. Leaky fuel delivery systems with vented vapor losses, restricted air induction systems i.e. dirty filters. Intake air can also be too hot or cold. Restricted exhaust scavenging systems. Operating temperatures of fuel and engine. Carburetors with bad power valves, accelerator pumps and fouled choke systems. Carbon fouled injectors, sparkplugs, and piston rings. Type of transmission, automatics without lock-up converters and over-drives, gear ratios. The type of tires, tire size, the tire pressures and the wheel alignment. Example; Just think, is it possible that larger wider tires require less ‘toe in’ that could reduce drag and get better fuel mileage? But the larger wider tires cause increased air flow resistance. The vehicle speed, the load, the wind speed and direction. The list can continue on including the type and additive mix of the gasoline. Gasoline blends are changed continually by local area, altitude and season. These are changes in the volatility of the gasoline. Winter Gasoline will evaporate much faster in the summer temperatures and less octane is required at high altitudes.

An example of the simple formula is 200 miles divided by 10 gallons = 20 MPG

Full tank amounts will vary due to air trapped in the tank but the MPG will average out in the long run.

Here are a few thoughts about saving fuel.

First thing a driver will notice when they start to conserve fuel is it will agitate other drivers around his vehicle. Please be considerate of other drivers who have no concept of your economy driving. The other drivers want to race to the next stoplight and remember, If they don’t get there quick enough they won’t get to stop! When the timing of stop lights is known then speedind up to make a green light can save a little. 1. Think about driving as an art while doing so. Stop rubber-necking, turn off the music, turn off the cell and drive.

2. Install a dash-mounted vacuum gauge and use it. As the fuel mileage drops the vacuum needle drops. Try to prevent the needle from dropping below five inches. Readings will change with altitude changes.

3. Drive as if you had a fresh egg taped on the accelerator AND brake pedals.

4. Apply accelerator and brake petals smoothly.

5. Reduce speed as much and as soon as possible. Speeds above 50 MPH eat into the pocketbook!

6. Scan far ahead of your vehicle for traffic control signals and things that will allow you to ‘get off the gas’ sooner so you don’t have to ‘hit’ the brakes as hard – later. The over use of brakes means fuel has been wasted.

7. Drive as if your afraid your brakes are in poor condition and you are trying to save them.

8. Purchase your fuel in the morning when it’s cool and keep the tank full.

9. Air you tires up when they are cold and on the plus side of the recommended pressure and check them often especially on cold days. switching to nitrogen in the tires might help fuel mileage. Soft tires eat fuel!

10. Small amounts of high quality low ash synthetic Out Board 2cycle oil in the fuel (less than ¼ Oz per gallon) will clean and lubricate and reduce friction. The low ash oil will help the following items for better fuel mileage and life; electric gyrator fuel pumps, carburetor/injector parts, spark plugs, valve stems, compression rings and EGR systems. One fouled spark plug can drop fuel consumption by 10 percent. One sticky fuel injector can drop fuel mileage by up to one third.

11. Air dams can enhance cooling and reduce aerodynamic drag. Reduce the amount of air getting under the truck because the underside of vehicles create much air turbulence and drag at highway speeds. Bug shields, sun visors, wind deflectors, large roof top racks and large outside mirrors will reduce fuel mileage. Small camper shells or bed covers on pick-ups seem to aid fuel mileage.

12. The effect of heavy loads is detrimental to fuel mileage and brake life.

13. Modifying a vehicle with lifts and large wide tires is detrimental to fuel mileage and brake life.

14. Cruise control may save fuel in ‘flatlands’ but may not be economical in hilly country.

15. In hilly country do not allow the down hill run to cause engine ‘braking’ i.e. slowing down the vehicle unnecessarily. Run your fastest speed at the bottom of a hill and the slowest at the top. ... Only use engine braking when the vehicle is going to gain excessive and unsafe speed that would have required a fair amount of regular brakes. Excessive downhill braking can cause many heat related problems. Among these are warped rotors, brake fade, boiling brake fluid, wearing out pads, over heating seals, bearings and lubricants.

... Down hill engine braking and downshifting for increased engine braking is not going to consume very much fuel because the throttle will be closed. Long downhill runs of five or more percent grades are a good time for downshift engine braking. Two miles of seven-percent grades with curves should be mandatory.

So in hilly country it's a case of the having to use more throttle to regain the speed you lost by allowing short periods of unnecessary engine braking.

16. Allow the engine to warm up and/or drive gently till it does. Cold engines can get poor fuel mileage.

17. Put the transmission in neutral or stop the engine when long waits in traffic are encountered I.e. train crossings and long red traffic lights.

18. Reduce the Air Conditioning and the electrical demands on the alternator. Alternators draw much horsepower and extra fuel so fancy lights and sound systems burn extra gasoline and bother other peoples eyes and ears.

19. Short shifting. If the automatic transmission is equipped with overdrive and/or lock-up torque converter learn at what speeds it changes gears/locks. Often one can get the transmission into overdrive and lock the converter sooner by backing off the accelerator pedal a little at the right time.

20. The use of WOT (Wide Open Throttle) to gain speed can wast fuel.

21. Consolidate your trips. Do more errands per trip and reduce the number of trips. This doesn't increase mileage but can cut the use of fuel.

22. Gasoline bends vary widely, station to station and area to area. Ethanol blends (like 10%) do not get the power or fuel mileage that 'real' gasoline or MBTE blends of fuel get.

23. Hey!.. wake-up!!  We are sorry we put you to sleep… do you have any other ideas?

Have a good one  and  CUL.. Don S.. aka lakota