General Motors reported on Thursday a year-over-year sales decline of 5.5% with 670,974 new vehicles sold during the third quarter. Its all-electric vehicle sales are down across the board, as consumer enthusiasm for EVs wanes. Experts expect GM's weakness in the hybrid vehicle sector to impact its overall sales, potentially offering an opportunity for hybrid leader Toyota Motor to catch up. High fuel prices are also expected to impact sales of big trucks and SUVs, segments GM relies on.