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Comparing forklift fuel efficiency demands a granular analysis, starting with electric models consuming 15-25 kWh/ton-mile at $0.03/kWh, equating to $0.45-$0.75/ton-mile, supporting 3,000-6,000-pound loads over 8-hour shifts with 1-hour opportunity charges. Diesel units, at 0.4-0.6 gallons/ton-mile with $4.50/gallon fuel, yield $1.80-$2.70/ton-mile for 10,000-pound capacities, sustaining 10-12 hours with 5-minute refuels, though Tier 4 emissions add $500 yearly compliance. Propane, at 0.5-0.7 gallons/ton-mile ($4.50/gallon), costs $2.25-$3.15/ton-mile, offering 11-hour runtime but requiring $600 annual tank maintenance. Efficiency metrics, per ISO 1496, factor 20% energy loss in IC combustion versus electric’s 5% in lithium-ion, with regenerative braking recouping 25% for electrics. Maintenance savings—$1,000-$1,500 for electrics versus $2,000-$3,000 for IC—stem from sealed systems, though battery replacements ($5,000 every 5,000 cycles) offset gains. Real-world tests on 5,000-pound loads over 1,000 hours show electrics at 90% uptime versus 85% for diesel, with $6,000-$12,000 yearly fuel budgets guiding choices. Environmental impact—electric’s 50 tons CO2e versus IC’s 80 tons over 5 years—tilts scales for green ops, aligning with 15-20% ROI targets.