Sprocket/Mpg ratio?

[Dudeofrude]

As some of you know I have a -2 front sprocket on my bike and as such my fuel economy is shocking (around 80-90miles from a full tank) so I'm looking whether Isles worth changing it out.
I'm looking at a 'track day' AFAM sprocket set which is -1 at the front and +1 at the back so it will keep the same level of acceleration.
What I'm wondering is would that be just as bad or would it improve the mpg?

[pilninggas]

http://www.gearingcommander.com/

[Dudeofrude]

http://www.gearingcommander.com/

Thanks for that. Some interesting info on there, not quite sure I unsterstand it all haha but it says that my rpms are 13.33 higher than standard in any given gear so does that mean my mpg is 13% worse?

[pilninggas]

[quote author=pilninggas link=topic=21883.msg253066#msg253066 date=1487531659]
http://www.gearingcommander.com/

Thanks for that. Some interesting info on there, not quite sure I unsterstand it all haha but it says that my rpms are 13.33 higher than standard in any given gear so does that mean my mpg is 13% worse?
[/quote]

not necessarily - but from my own experience it will be a little less if more revs needed for a given speed (equally gearing up results in slightly better economy for cruising at speeds near peak torque).