OK - THANKS TO YOU- ALL I FIGURED IT OUT!
So after my first post- and having only ridden 40 miles... i went and filled up the tank to the top with about 1.5 gallon (?!?!?!)... then bounced on the back of the sled as was advised.... and yep... sure enough... lol... she …and i got 1.5 more gallons in.. (3 TOTAL)
so.. i guess 3 gallons of gas for 40 miles isn't bad (of course i don't really know now if i had it really full before my 40 mile ride)...but it appears its not sucking way too much gas...just normal amount i feel.
Who woulda ever thought you had to burb the sled when filling it up... I wouldn't have believed it if i didn't see if for myself!
So i wont rely on gauge accuracy to much...more on the trip miles... and ill plan on at least 100 -130 miles per tank for reference.
THANKS ALL FOR THE INPUT!!