Re: Trying to save gas

Posted by MarkB_MI on April 20, 2011 at 03:29:39 from (32.178.100.21):

In Reply to: Trying to save gas posted by 37chief on April 19, 2011 at 21:03:03:

It is a misconception that opening the throttle decreases mileage. This idea originated in the days of carbureted engines, where accelerator pumps and power enrichment circuits wasted fuel every time you stepped on the gas. Fuel injected engines don't work that way; they use exactly the amount of fuel necessary for stoichiometric burn.

Actually, gasoline engines (particularly fuel injected ones) are most efficient at wide open throttle. At lower throttle settings there are throttling losses that increase specific fuel consumption. That's one reason overdrive gears help fuel economy: the engine has to be run at a higher throttle setting when it's in a higher gear in order to produce the same power as it would in a lower gear.

You can squeeze a bit more mileage out of your vehicle by using the highest possible gear for hill climbing. That's easy enough to do with a manual transmission; with an automatic try to hold the throttle just short of the point where it will kick down to a lower gear, letting the vehicle decelerate a few mph if necessary.

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