1 lap Qualy = 1 completed lap. If you spin and crash on your lap, it won't count, so you can go again. If you spin alone though, then it's just bad luck
Interesting I never noticed this either and I never noticed the 130 L tank until after I had completed my new 150; that was scrapped and had to start a new tank!!
Maybe you should have just mothballed that 150 l tank since the Season Four Rulebook will allow that size of a tank, as well as increasing the chassis minimum weight to 350 kg from 90 (not like anyone is close to either minimum of course).
Rob, do you really need a 150L tank for racing anyway? None of the tires I've used can last as long as 150L of fuel. Great for testing but a bit too much weight for racing.
I have not noticed a difference in weight for my fuel tanks if they are 50 L or 150 L so I always build the largest tank to allow more race options.
Also all tires should last at least half distance so if I was you I would retest your tires to see when the blow rather then just when they hit terrible. I run my tires on terrible for most of the race since the risk of a blow out is worth the lack of stops.
I was 1 stopping last year for most of the races unless I wanted a speed boast from starting near the front so would run 2-3 stop races but didn't need too due to tires.
I don't have the figures anymore but there was a weight difference between 50 L, 100 L and 150 L tanks. I ran with all three last season; I used the 150 L for testing (longer stints), the 50 L for qualifying (lightest tank took a few kg off; weight is speed), and a 100 L for racing (balance between the two). In most cases I never really found it feasible to run a one stop race with a 150 L tank, while racing with the 50 L would require a 3 - or more - stop race. With the current 70-130 L range it really didn't make sense for me to go with that option.
