The Max burns a little over 2000 KG an hour. Approx the same as the E190, but with 70 or so extra passengers.
On a 5 hour flight you should save approx 2500 to 3500 KG of fuel over a CFM56. It is pretty amazing how engine efficiency has changed in the last 20 yrs.
High G issues? push the nose down 2.5 degrees on a high G manuever?
According to the information I have the MCAS will still only trim .67 units for the high speed (high G) increasing AOA. The 2.5 was the mod for low speed to create the necessary stick pressures. .67 still worked for high speed, but it needed to be adapted. Ooops.
Tuff