I wish training arena having same conditions as other arenas

[FLS]

Is there a way to practice manual bombing calibration in the training arena?

If there is a trainer in the TA they can change the setting for you. The easiest way is just to use the training arena offline. You get the airspawn bases with whatever settings you choose.

[icepac]

You obviously only know of the MA. 

Actually.....I checked every online arena and only two had fuel burn other than 2.0

One was the training arena and the other was a special events arena where we raced 163s that evening.