Pat Anderson
New member
OK, somebody who knows, please come back here...
I always thought that at a given RPM an engine would have a steady fuel burn rate - say at 3500 RPM, you would be burning 4 gallons per hour, and the the effect of current and wind would be that you might be going at a lesser rate of speed, i.e., your miles per hour would drop, but your gallons per hour would remain constant at that RPM. If you were going faster, your miles per gallong would be better. Of course, if you were going slower, your miles per gallon would be less too.
But it doesn't seem to be working that way, and I am puzzled. Although propped up, and I am now going 13 - 14 mph at 3500 RPM instead of the 9 - 10 mph I was doing before, I don't seem to be getting better fuel economy. This is calculated with the standard GPS trip odometer and the gallons used on filling up...
So what is going on here????
I always thought that at a given RPM an engine would have a steady fuel burn rate - say at 3500 RPM, you would be burning 4 gallons per hour, and the the effect of current and wind would be that you might be going at a lesser rate of speed, i.e., your miles per hour would drop, but your gallons per hour would remain constant at that RPM. If you were going faster, your miles per gallong would be better. Of course, if you were going slower, your miles per gallon would be less too.
But it doesn't seem to be working that way, and I am puzzled. Although propped up, and I am now going 13 - 14 mph at 3500 RPM instead of the 9 - 10 mph I was doing before, I don't seem to be getting better fuel economy. This is calculated with the standard GPS trip odometer and the gallons used on filling up...
So what is going on here????