This earlier pull from the same session shows identical fueling behavior, confirming this isn't a heat-soak or transient issue. Looking at 12:31:16 data, we see the same lean tendency under load, but something interesting appears - the initial lambda control is slightly better at the beginning of the pull. This suggests the fuel system has capacity but is struggling with sustained demand. Comparing all logs from this session (12:31, 12:34, and 12:35), we're seeing a consistent pattern: Initial fueling adequate Progressive lean condition under sustained load DME maxing corrections unsuccessfully Boost control remaining stable ANALYSIS: Your fuel system appears to be at its flow capacity limit with E20 demands. The consistency across multiple pulls, regardless of timing, strongly suggests hardware limitations rather than tuning issues. NEXT STEPS: Install both pumps together Re-baseline with 93 tune first Then progress to E20/E30 testing This gives proper headroom for current setup and future Pure P600