I just stopped and filled up for the first time since I put the new fuel tank and pump in and when I topped it off I went in to pay and the total was $32.xx for my gas.
At $1.73 a gallon for 93 octane there was 18.5 gallons I had pumped. The original tank holds 18 and this tank holds ??? gallons, as when I started pumping the fuel gauge showed just shy of 1/8 tank.
Anyhow, I was sure surprised to see that much put in there.

I managed to put in 18.2 gallons the time I ran out of gas. Boy did that suck. Luckily my car coasted the extra 5 blocks to the station.

My dad also claims he has put 21 gallons in his 1989 Buick Lesabre on multiple occasions. They are supposed to have the same tank as the 1992-newer Bonnevilles according to the Hollander exchange manual.

Me thinks your dad got ripped off by an unscrupulous gas station. My 89 LeSabre had an 18 Gallon tank. With that said....I'm sure it'* possible to add more gas by manually adding gas from a gas can and filling it to the neck(I'm not sure if this is a good thing to do though).

Mine holds exactly 70 liters or 18.5 gallons.
At $1.03 per liter for 94 octane it usually costs me over $60 to fill up.. ..it'* never dead empty.

Yes that'* Canadian $$.

I think this is a rather personal question...

72 litres, on a good day...45-50 Bones... never dry

dang thats a lot of money for gas up in canada...i ran outta gas and made it to the station and i think i put 38$ US in

17.1 gallons but it seems alot bigger to my wallet :(