Giveaways: Anybody Seen Wayne Walker?

"They're winning at Sunoco!" has been the come-on TV jingle for Sun Oil Co.'s "Sunny Dollars" game, and each week a high-speed teletype hammers out the names of winners, followed by amounts ranging from $1 to $1,000. Humble Oil invites drivers to stop by at its filling stations to play "Tigerama." Mobil's "Winning Line" offers $1,000 to anybody who completes a card with pictures of three gas pumps; Sinclair offers up to $2,500 to customers who match up coupons to spell out a slogan in its "Dino Dollars" contest. With no requirement that the driver buy gas (thus ensuring...