RAC

Turning automated bidding into a performance engine

RAC transformed its paid search strategy by shifting from manual, intraday bidding to real-time automation, boosting revenue and conversion efficiency.


Man fixing car using technology
  • 27%

    Revenue increase
  • 30%

    Conversion rate increase
  • 4%

    ARPU increase
  • 14%

    ROAS increase

Overview & key takeaways

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Services
Experience & Commerce

Industry
Automotive

Market
Europe

Tech Partners
Adobe

The challenge

Historically, RAC had relied on intraday bidding combined with manual cost-per-click (CPC) to drive online sales revenue, a strategy validated by internal tests in ’21 and ’22 that outperformed auction-time bidding (ATB). While concerns about past underperformance led to hesitancy in adopting ATB, particularly during key sales periods, RAC decided to leverage advancements in Google’s real-time bidding and run a structured, low-risk test to reevaluate its potential.

man looking under the hood of a car with a laptop
man looking under the hood of a car with a laptop
man looking under the hood of a car with a laptop

The approach

RAC tested to see if combining ATB with value-based bidding (VBB) would drive stronger performance and efficiency than its existing paid search strategy. It primarily measured success through improvements in average revenue per user (ARPU) and return on ad spend (ROAS), with secondary goals of increasing conversion rate and high-intent traffic volume. It deployed multiple 50/50 tests across high-volume campaigns, comparing the ATB+VBB model to the baseline. Performance analysis focused on cost-per-acquisition (CPA), revenue, and bid efficiency.

Merkle supported end-to-end test design and execution, selecting the right campaigns, configuring SA360 split tests, and aligning Floodlight conversion values with business goals. 

The outcome

The results were decisive. Campaigns using tROAS with ATB and Floodlights performed better than those using tROAS with intraday bidding or manual bidding with intraday. This held true during critical sales events and regular business periods. The company saw a 27% increase in revenue, a 30% increase in conversion rate, a 4% increase in ARPU, and a 14% increase in ROAS. As a result, RAC decided to implement ATB-powered value-based bidding as its default strategy for performance-focused paid search campaigns.

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