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What they are promoting, and what has been in smaller print on automobile window stickers for a few years, is to calculate the quantity of fuel consumed per hundred miles instead of the number of miles per gallon. Their argument for this is that it gives you a linear function to compare fuel efficiency of different vehicles. To quote the article:
"The advantage of measuring fuel consumption this way is that it makes comparisons easier as fuel efficiency improves for a specific vehicle. Thats because the differences are linear. With miles per gallon, efficiency is graded on a curve. For example, for a 15-mpg car, a 5-mpg improvement is a 33-percent gain. But that same 5-mpg upgrade for a 30-mpg car is only a 17.5-percent improvement to a vehicle that is already using half as much gas."
Gallons per hundred miles is an inversion of miles per gallon way that most of us are accustomed to thinking of fuel economy. It works better for doing a mathematical comparison is the point of the article.
I'm not really clear on what points @mkayx was trying to make at 3:30 in the morning, but my take away from the Popular Science article is that it's a handy figure to have if I'm concerned about fuel efficiency. I still just go back to any motorcycle is more fuel efficient than my 13mpg truck.
First thank you for the link that works.
second trying to i form why there is a difference between the mpg between gas from pump into tank divided by miles ridden mpg and way it differs from power vision mpg readings
second trying to i form why there is a difference between the mpg between gas from pump into tank divided by miles ridden mpg and way it differs from power vision mpg readings
I don't think PV is deriving your Trip A Econ the same as the PopSci article. I thought the PV was tied to the bikes data port (ECM) which estimates the MPG. Correct me if I'm wrong, which I am most of the time.
If the PV does the calculation in gallons per 100 miles, then it should also provide the gallons used. Kindergarten math to calc the MPG from there.
Do you reset the PV trip A when you fill up?
If you don't reset the PV trip A you may be getting the Average MPG over a longer distance from the PV (since the last PV Trip A reset)
How close is the mileage in your trip A on the speedometer compared to the PV Trip A mileage?
How close to the Gallons used on the PV trip center is your actual fill-up?
On the PV trip center there is a Mileage correction setting that you can use to adjust the PV MPG by a percentage.
You can adjust the Distance, Fuel Used and Economy (mpg) separately.
With mine set at 1.00 I usually got with in a tenth of a gallon when I reset both the Speedo Trip A and the PV trip A at each fill-up.
Do your PV gauges ever stop responding while riding?
If they do the PV will not include the miles / gallons used during the time the gauges are not responding.
Last edited by shanneba; Aug 19, 2021 at 05:28 AM.
You don't buy all your fuel in advance so who cares ? You're still going on the ride , run or trip so just leave the gizmos in the office , empty your mind of rational thought
and enjoy the ride . It's a Sportster for goodness sake . Like a Harley Davidson but more fun .
First thank you for the link that works.
second trying to i form why there is a difference between the mpg between gas from pump into tank divided by miles ridden mpg and way it differs from power vision mpg readings
The Popular Science article and the alternative statistic for fuel efficiency are irrelevant. Either miles per gallon or gallons per 100 miles can be derived from each other. If the Power Vision is totalizing the fuel flow through the injectors over any distance and you calculate the gas you put in the fuel tank to ride that distance there are three possible results:
1) The numbers match
2) Somebody sucks at basic math
3) Your bike is leaking fuel
Let's take some round figures. If my Street 750 gets 50 miles / 1 gallon it will get 2 gallons/100 miles. The first figure is handy for figuring out how far I can go on a tank of gas, the second makes it easy to figure out how much gas I burn riding 5,000 miles/year.
If I drive my car it gets 3 gallons/100 miles, thus it gets 33.3 miles / 1 gallon. THERE IS NO OTHER CORRECT ANSWER.
Last edited by Pugslycat01; Aug 19, 2021 at 02:52 PM.
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