I myself have no problem making 3 gallons per month
. So I could vote for option '3'. But I wont, due to the reasons below.
Some people might not make 3 gallons per month, due to efficiency, or newly created electric cars, and so on
. So, how about :
Option 4...
(1) Members with no 3-gallon fills in the last 28 days will use the following system : Competition EPA = (90-day average * 0.5) + (Last fill * 0.5). If the last fill was < 3 gallons then just use : Competition EPA = 90 day average.
For the 'mileage' for the team calculations, use (90-day mileage) * (28/90) -> average mileage per 28days.
Any sub 3-gallon fill = 5% team penalty for that cycle.
This is better than the above, because, it gives some 'weight' to your more recent fills, while giving a penalty based on the 90-day average. After 2 more competition cycles, the 90-day average will be similiar to the most recent fill.
So, how about option 4? (Not as extreme as 1 or 2, which will result in 1 or 2 team members consistently being dropped (whoever is lowest in the team). These people will no longer bother to be part of team, most likely?