570 or 850 mpg

I am currently torn between a 570 eps and a 850 scrambler or sportsman. I do a wide variety of riding from gravel roads, aggressive trail riding/mudding and work around the house like plowing. I currently have a 550 which does good on gas on my trips in Northern Minnesota with friends. Is there a big difference between a 570 and 850 for mpg? I can obviously carry extra fuel. Just curious what people are ACTUALLY getting, not what there specs claim..

Thank you

570 or 850 mpg

I am currently torn between a 570 eps and a 850 scrambler or sportsman. I do a wide variety of riding from gravel roads, aggressive trail riding/mudding and work around the house like plowing. I currently have a 550 which does good on gas on my trips in Northern Minnesota with friends. Is there a big difference between a 570 and 850 for mpg? I can obviously carry extra fuel. Just curious what people are ACTUALLY getting, not what there specs claim..

Thank you