If 2.5 ounces means the world to you - get a pair of VPXcells for ignition -1100ma (2.5 oz all ready to go ) .
on any single cyl -this is plenty for a day
on twins -depends on how many flights and rpm of engine !
Add diodes if you have 4.8 ONLY type ignitions - be sure to get large diodes .
many advanced type ignitions (with multiple functions uch as included tach,auto cutof etc., like a full sip of power for each cycle -
Do NOT starve the ignition module .
you could kill it.