Noticed a leak beneath rear of car and determined it was gas, leaking heavily. Had it taken to a master mechanic who determined the leak was from the gas tank along the seam. The tank was drained and taken to a radiator shop where it was soldered, then returned, replaced and gas added. No leaks were discovered for an additional 24 hours. However, four days later when the car was picked up (we were on vacation during the repairs), the car had been driven 5 miles back home and left in the driveway for 36 hours in intense heat (over 105 degrees) for most of that period. When it was driven the following evening, there was just a speck of gas in the tank. I refueled it with approx. 3.5 gallons and noticed that again, it was leaking like a sieve. Our warranty no longer covers the repairs because it expired when we hit 60K miles (am seeking reclaimation with manufacturer at this time since this was not something that should have EVER happened and should be covered even if we're 2K over the warranted mileage) and are currently having the tank welded or possibly replaced (still in the process of repair) therefore the $300 is just an estimate of the cost to repair this problem.