Just as the summer travel season comes to a close, Americans are facing the most expensive Labor Day gas prices on record, extending the squeeze on household budgets for millions hitting the road over the holiday weekend.AAA says nearly 40 million Americans are expected to drive over the holiday, but they'll be paying unprecedented prices at the pump.The national average for regular gasoline reached $4.14 per gallon on Monday, up about 4 cents from last week and nearly 95 cents higher than a year ago.FORGET GASOLINE: THIS OVERLOOKED FUEL COULD RAISE THE PRICE OF NEARLY EVERYTHING YOU BUYIf tha...