Hi moonlite:
I cant say about the influence of the bladder.
My tips.
1. Did you finish to refill when the pump has automatically shut off ?
Then you pull the nozzle, refill again very slowly trickling with watching for carefully return gas. , In Japan , nary one more gallon into the tank . I try this every time.
2. Did you set the Prius is the front up ?
If you set the front dawn, you can refill some more gallons. I try this every time.
Some one did jack up the rear, then refill more 2 gallons. I dont try to jack up.
USK
Bordeaux mica 2001
Life time 58.3MPG (at 19,717miles)
Longest mileage in [Album] : [Best Mileage]
Every mileage/tank in following URL
http://eshy.s22.xrea.com/cgi-bin/nenpi/nlist.cgi?hn=USK
__ mi. = 0.62137 * Km ____ MPG = 2.3521 * Km/L ____ gal. = 0.26417 * L