Every time you have the Z alignment checked. How much fuel is in the tank, and any items that you keep and remove from the Z. When making comparisons. You want to keep everything the same.
Gasoline weights about 6.3 lbs per gal.
Full tank is 19 gal = 119.7 lbs.
3/4 tank is 14.25 gal = 89.775 lbs.
1/2 tank is 9.5 gal = 59.85 lbs.
1/4 tank is 4.75 gal. = 29.925 lbs.
So for each 1/4 tank. You have about 30 lbs of weight that is almost centered in the Z. It might not seem like much. But it does have an effect.
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