Evidently there were several versions of that commercial. I found this one on Spotify:


MONTREAL EXPRESS – Commercial
As sung by Dick Curless on "The Travelling Man, Vol. 4" (2013)

Out Concord way I hear 'em say the hist'ry books are wrong.
Old Paul Revere never did, I fear, ever come ridin' on.
'Twas April, right, but what a night! No one did undress.
In bundlin' beds they just hid their heads from the Montreal Express.

The lanterns lurched in the Old North Church and the British held their boats.
The houses shook and the gals all took to makin' maxi-coats.
Of course today so warm we stay with gas; we heat for less.
Don't tread on me, this wind that we call the Montreal Express.

SPOKEN: Change to natural gas heat, the clean-air fuel for ecology and economy. Boston Gas keeps your home warm all winter, clean all year, with a comfort only low-cost gas can give, because nobody, but nobody, heats cheaper than gas.

SUNG: Boston Gas heat's the only way to beat the Montreal Express.