This is the caption for Layout Figure Tag 8.1L Vortec V-8 vs 6.6L Duramax Diesel Various marine and motorhome applications GM retired the engine internally following the 2006 model year, but continued to manufacturer the engine for applications outside GM vehicles through 2009. 2001 Chevrolet Suburban (GMT800) 8.1 i V8 2500 (344 Hp) 42.3 Hp/l 617 Nm 3200 rpm.
#SUBURBAN 2500 8.1 VORTEC MPG MANUAL#
In Silverado and Sierra HD applications, the 8.1L Vortec was available mated to either the Allison 1000 automatic or ZF 6 speed manual transmission. In GMC and Chevrolet SUV applications (including Suburban and Yukon 2500 models), the engine was mated exclusively to the GM 4L85E four speed automatic transmission.
The 8.1L's substantial torque rating and flat torque curve also make it suitable for marine and motorhome applications, typically as an economical option to more expensive diesel powertrain offerings. Owners can expect to see MPGs peak in the mid-teens on the highway and drop into single digit territory with heavy towing. Because the engine is only found in vehicles with a gross vehicle weight rating (GVWR) greater than 8,500 lbs, GM was not required to provide estimated fuel economy ratings through the EPA. However, those that acquire a vehicle with such an engine must obviously have needs that don't include fuel efficiency and the performance of the engine, particularly its low-end torque, is a more pertinent factor.
One could argue that the Vortec's major disadvantage is its fuel economy or lack thereof.
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