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The internet seems to think there's about 1/3 of a gallon left of whatever prior person had at the pump. And it's worth noting that the majority of newer cars seem to require premium. And the premium is more like 94 or 95 octane, not actually 93. So if you put in at least 2 gallons, definitely 3, of 93 you're very likely a total of 93 or better even if prior person did 87. I find even keeping my fuel level targeted at about 1/4 tank at start of autox I generally put in 4 or 5 filling up before I drive to the event, so I feel confident I'm getting at least 93.
If I'm doing a lot of trailering, then can use gas cans so that also solves the problem.
When I have a passenger it is very significant. Haven't had many passengers recently but probably at least 0.5 second on a 50-60 second course. And they're usually 200 lb give or take 40.
My guess is another 30 lb/5 gallons is around 0.1 seconds.
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