Although the 1000 engine is in the Zs,Cs and Us, all three will be different as all are for different usage and weights. Typically, for the Zs and Cs that trail ride average more MPGs then the UForce which is made to work. Reports on the Zs and Cs range from the 10s to 16mpg range. I would suspect the Us will be somewhat less overall. I also suspect if one could trail-ride a U Force like a Z, the mileage would be similar to the Z. Hopefully someone with a UForce 1000 will chime-in with actual numbers.