Gas Mileage?

[flynrider]

Here's some pics from todays fill to show the accuracy of the computer:

Mileage on this tank of gas

[url=http://smg.photobucket.com/user/theferret111/media/Oct30001_zps166dd58f.jpg.html]

Computer says this was my MPG on this tank of gas

[url=http://smg.photobucket.com/user/theferret111/media/Oct30002_zps23e6c2b3.jpg.html]

Computer says I used this much gas

[url=http://smg.photobucket.com/user/theferret111/media/Oct30003_zps585375f6.jpg.html]

I then drove 2.5 miles to gas station and filled up as usual. Here's how much gas it took

[url=http://smg.photobucket.com/user/theferret111/media/Oct30005_zps2adcaaa6.jpg.html]

So in actuality, after driving to gas station I had driven 191.8 miles and used 3.4 gal gas for calculated average of 56.4 mpg instead of the 57.9 the computer said I got.. or 1 1/2 mpg difference over 2 days and nearly 200 miles. That is pretty accurate to me.

After filling up, I of course zeroed the B mode. Next I ran over to my brothers house. 20 miles on interstate I-275 at 70 MPH. When I got off the exit I reached up and checked. It read 48.9 MPG. Running over 60 kills the gas mileage on this bike.

It's aerodynamics. The upright riding position doesn't help. The amount of power required to overcome aerodynamic drag rises on a steep curve as speed increases. Consequently, your MPG will follow a mirror image, steep downward curve as speed increases.

We deal with this in the airplane world all the time. If you want to get somewhere fast, you pay for it with a higher fuel burn. If you're not in a hurry, you can save a substantial amount of fuel over the same distance by cutting the speed down.