FRANKFURT—Volkswagen is convinced that its 2.9 billion euro ($3.3 billion) offer for France’s Europcar, made as part of a consortium, fairly reflects the firm’s value, a senior executive said, pouring cold water on hopes for a higher bid. “With a takeover premium of 30–40 percent, depending on the reference point, we have presented a very attractive offer,” Christian Dahlheim, Volkswagen’s head of group sales and one of the main architects of the deal, told Reuters. Volkswagen, along with asset manager Attestor Limited and Dutch mobility group Pon Holdings BV, is offering 0.50 euro per share in Europcar, which could be topped up by 0.01 euro per share if 90 percent of shareholders take up the bid. Shares in Europcar currently trade at 0.508 euros apiece. Under the offer, first announced in July and launched on Friday, Europcar investors have at least until Dec. 30 to tender their shares. Investors representing …