Don't know what the value is for a Triumph . . . but it certainly can have a
big effect, particularly when you start going really fast.
I had a truck once that I made long Interstate trips with at high speeds.
(I assume it had a crappy aerodynamic drag coefficient)
I knew that I could only get about 250 miles from a tank of gas if I was
lucky. (at interstate speeds averaging 70mph or more)
Then one weekend I followed a friend across the state taking backroads.
It was largely uninterrupted driving, but the speeds were much lower.
I'd guess I averaged under 50mph on the state highways.
I got well over 300 miles on a tank of gas that day.
I found a pretty good explaination (meaning it didn't go way over my head)
on that site: How stuff works.
http://www.howstuffworks.com/question477.htm
If you have never browsed around that site. . .take a look.
You'll get all kinds of answers to your questions.
Tink
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