Video: 8.1L Vortec Engine Specs - HCDMAG.CO This is what allows it to tow much better. The Vortec 8.1 was designed for maximum torque at a very low RPM. A 6.0 LS would make an excellent engine for a high horsepower street car, but not a truck that tows stuff a lot. Although we love LS engines, they aren't exactly built for the same purpose as the Vortec 8.1. Gas Mileage - 8.1 Vortec Obviously not an engine problem but potentially one of the most disliked aspects of the 8.1 engine is the gas mileage! With city driving, you can expect single digit numbers from 7-9mpg and highway will usually range from 12-14mi.On average, vehicles equipped with the 8.1 get less than 15 miles per gallon In fact, Chevrolet stopped manufacturing this motor after six years, possibly in part due to pressure to produce more fuel-efficient vehicles. A Chevrolet 8.1-liter V-8 motor is a large and powerful motor that is not recognized for its fuel mileage.However, I am still curious as to what I should really expect to obtain when it comes to mpg. Apr 15, 201 2006 Silverado Ext Cab Short Bed 2500HD 8.1L Vortec 6spd Allison I realize that to even ask a question about Gas Mileage for this type of truck is pretty immaterial as to its purpose. Any sort of two lane highway dropped it to around 7.0, even at 55-60 mph. Heavily weighted toward interstate cruising (we crossed the USA multiple times) where mpg was optimal, usually 8.0-8.1 at 64-65 mph.
Mileage seems to drop about 1-2 mpg when I tow a 20 foot bass boat, but I didn't buy this truck for the mileage either The 2002 W22 we had averaged about 7.6 mpg over 50k miles. My overall mileage according to the information center on the dash is 12.9 after 26,000 miles. I have an '04 2500HD with the 8.1 and Alison transmission and my mileage averages 12-14 per tank.
The thing pulls like a freight train! DWitcher, # My 2004 36 foot Workhorse chassis with the 8.1 engine has averaged 7.1 MPG over the past 90,000 miles pulling a 4,000 lb toad 05-04-2005, 12:52 PM. My neighbor has a 2001 Chevy 3500 4x4 with the 8.1 and in town its 9mpg unloaded 12mpg on the freeway unloaded and pulling 10,000lb bumper pull he says the best was 11mpg on the interstate. Although this large displacement engine produces considerable horsepower and torque, it was retired in favor of a more economical engine platform The GM 8.1L was introduced in 2001 and used in various heavy duty applications, including Chevrolet Silverado and GMC Sierra 2500/3500HD pickups, through the 2006 model year. 8.1 Vortec Performance Specs The power and torque of this engine varied widely depending on specific application, as is common with all engines used across a variety of platforms GM 8.1L Vortec V-8 specs, history, and horsepower and torque curves. About 75% of the miles are at highway speeds for my mpg figures In fact, the primary complaint is the gas mileage, which most state is in the 8-10 mpg range, but that is to be expected with an 8.1 liter gasoline engine. Only put about a 1000 miles on it since I bought it about 6 weeks ago and only towed with it once for about 50 miles. I have a 2001 2500HD CC with 8.1, allison trans, and 3.73 gears.
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