 Startup hybrid powertrain developer Hyliion Holdings is delaying its Class 8 natural gaselectric Hypertruck ERX for a year, and a new natural gas engine from Cummins Inc. raises doubts for the future of Hyliions current product, a power-boosting hybrid add-on. Both developments impacted by the supply chain crisis led to a double-digit intraday decline in Hyliions share price as analysts questioned founder and CEO Thomas Healy about countermeasures. 