Excellence and Experience for over 88 years and counting… The actual fuel costs are heavily influenced by operator style and duty cycle (think gas mileage difference at 45 mph vs 75 mph). A smaller displacement truck may offer minor reductions in fuel used while idling, but the fuel curve of the trucks at high loads are based on the consumption of fuel per horsepower-hour. In other words, if you do the same work (same average horsepower per hour) there is very little difference in fuel consumed. Low end torque is heavily influenced by displacement. Even at the same horsepower, the smaller displacement engines have some performance disadvantages. In tests that we have taken, experienced operators have noticed and commented on the smaller displacement engines not performing as well as the larger ones. TIER 4 Final Warning: TIER 4 Final engines also require the following fluids. • Ultra Low Sulfur diesel fuel • API CJ-4 Low Ash engine oil • Antifreeze required Maintain 50/50 Soft Water ** Ethyl- ene Glycol (Low Silicate)(GM 6038-M or ASTM D3306 & D 6210) **Soft water - Cannot contain more than 300-ppm hardness or 100-ppm of either chloride or sulfide. (These fluids will also work in existing units with TIER II and TIER III engines.) To insure that you get the best product for your company, Taylor has taken the approach that we will not give up performance or durability for questionable potential fuel cost savings. The DIFFERENCE: » Larger Displacement Engines Will Last Longer