Rental car firm Avis Budget Group ( CAR) is delivering solid upside -- relative to analysts' forecasts -- for an unusual reason. The company re-acquired Avis Europe last October, which had been sold off a number of years ago. When the deal closed, management promised a wide range of cost cuts and cross-selling synergies that would boost the company's profit profile. And analysts apparently failed to account for those gains in their earnings models. >>3 Auto Stocks to Buy Instead of Ford, GM To give you a picture of the benefits of the deal, Avis Budget noted that the acquisition was a big factor behind a 32% jump in revenue in the second quarter. Yet EBITDA grew at an even faster pace: 39%. That's the power of cost cuts. Earnings per share rose a solid 49%, compared with a year ago. Look for more good numbers for the rest of the year. Management expects to deliver more synergies in the third and fourth quarters. Taking a broader look at the impact of this deal, Avis Budget's annual EPS power is likely to rise from $1.65 a share in 2011 to around $2.50 a share in 2012. EPS may stay stuck in that range in 2013 while the U.S. and European economies stay weak, but by mid-decade, a firmer global economy could spike EPS well past the $3 mark, and perhaps towards the $4 mark. Shares look like a bargain in that context, trading at a recent $16 and change.