fuel use question

[Guest]

is the amount of fuel i use based on speed or engine speed?
like am i using the same amount of fuel in first gear @4k rpm as i am at 4th gear @4k rpm?

 

[Big T]

no. because of wind resistance. More mph means more resistance means more fuel used

 

[Nessism]

Also engine load. It takes more power to run in the higher gears, in large part due to the wind resistance.

 

[Guest]

thanks for the answers. been curious how fuel use works with multiple gears

 

[Burque73]

AS a side note, altitude, as well, can affect fuel mileage. If you can tolerate the pop-ups and crap ads here's a good explanation.

"A. Fuel economy improves at higher altitude in all engines because the pumping work is reduced. As you go up, a lower manifold vacuum is required to move the car. The lower vacuum means lower pumping work and the result is better fuel economy"

My 850 can range from 30 to nearly 60 MPG depending on altitude as well as other factors mentioned.

 

[Rob S.]

Fuel economy improves at higher altitude in all engines...

That's surprising to me, because isn't it true that your times will be faster at a sea level dragstrip, where the air is thick?

 

[pdqford]

is the amount of fuel i use based on speed or engine speed?
like am i using the same amount of fuel in first gear @4k rpm as i am at 4th gear @4k rpm?

Depends on what you mean by “amount of fuel I use”.
Are you measuring the amount of fuel you use in miles per gallon, or in gallons per hour, or in gallons per 1000/rpm, or in ???

Generally speaking, the wider the throttle blades are open, the more fuel goes into the engine.

 

[rphillips]

Very well put pdq, apples to oranges as they say.