Ive got a little over a gallon on mine now too and it's still tight. Im still heating to get it to fire up. So far though Im pleased as it has tons of power all the way through the power band and the run times are well over 10 min in truggy. And its never flamed out! Ive been running a 2057 pipe since thats all I had, wich made the bottom really smooth IMO, but didn't limit low end torque. I will be trying a 2081 this weekend and will post up results.