As many as 20 states could have average gas prices below $2 per gallon by Christmas as the national average for December slips to $1.98, according to GasBuddy, a national company that compiles data on gas prices and provides analysis. “We’re confident that our projections give consumers more than accuracy; we think they’ll help them identify some savings that should come in handy at Thanksgiving and Christmas,” said Patrick DeHaan, senior petroleum analyst for GasBuddy, in a release. “It’s interesting to remember that last year the national average shed more than $1.27 from Aug.