According to Formula's web page. 154gal fuel capacity.
So on mine it's a 50gal reserve.
I bet I'll still run out of gas one day thinking another 50gal should be in there...

According to Formulas owners manual...

Fastech 271 - 105 gallons
292 - 113 gallons
353 - 154 gallons
382 - 195 gallons

312 - 128 gallons

Thanks Rick, my OM didn't list the 312

Fast, I think that the last year Formula made the 312 was 2003. Probably why it's not listed in your manual.

I use the 1mpg rule .. reset the gps each time out and if I put 75 gal in I know it's time for fuel @ 75 miles ...m

419 = 235 gal

These have not been made since 2002 but that is what my info says for tank size.