The only gas assistance that an employer ever provided me when I was working for one was an endless supply of free Gas-X in the employee medicine cabinet.
On a more serious note. In the mid-90's, US Bank in Portland use to reimburse employees for 1/2 of a monthly transit pass. If I remember right, a $40 pass got you unlimited access to both the bus and lightrail systems at that time. I hardly ever drove my car the whole time I lived there.