If I put a windshield on my Vespa scooter, will I get better or worse gas mileage?

If I put a windshield on my Vespa scooter, will I get better or worse gas mileage?
My scooter is a 2006 GTS250ie and I plan to get Vespa’s flyscreen, which is a half sized windshield.

If I put a windshield on my Vespa scooter, will I get better or worse gas mileage? Answer :

Answer by steve s
you wont see a defference besides more wind when ur riding i always like the smaller windscreens

Answer by indianjohn
Worse by two spoonfulls a day no big diffrence

Answer by Susan S
I bought a 2007 GTS250ie this year and put the 1/2 flyscreen on and I’m getting better than 70 mpg. Since I started with the screen, I don’t have a comparison but I’m happy with that mileage and don’t see much wind shear from the screen.