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SVTPerformance's Chain of Restaurants
Road Side Pub
Gm Vortec 8.1L?
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<blockquote data-quote="RedRocketMike" data-source="post: 16651590" data-attributes="member: 51242"><p>I just bought an immaculate 01 2500HD 8.1. My two checked fill-ups got me 12.5mpg. 3.73 gears. Keep in mind the factory tire was 245/75/16. Even a 265/75/16 is going to throw your mileage/economy off - 5%. </p><p></p><p>They have oil consumption issues because of the intake manifold design and how oil vapor is sucked in. Supposedly the best fix is a lower thermostat.</p><p></p><p>The Allison trans in the truck is really nice. I wouldn't want to own an 8.1 behind a 4l80 with that sucky long first gear, which is what every 2500 suburban/Yukon used. Probably why they seem to have worse fuel economy.</p><p></p><p>I had a same year 6.0 2500 and it felt slow to me from a dig. The 8.1 roasts tires.</p></blockquote><p></p>
[QUOTE="RedRocketMike, post: 16651590, member: 51242"] I just bought an immaculate 01 2500HD 8.1. My two checked fill-ups got me 12.5mpg. 3.73 gears. Keep in mind the factory tire was 245/75/16. Even a 265/75/16 is going to throw your mileage/economy off - 5%. They have oil consumption issues because of the intake manifold design and how oil vapor is sucked in. Supposedly the best fix is a lower thermostat. The Allison trans in the truck is really nice. I wouldn't want to own an 8.1 behind a 4l80 with that sucky long first gear, which is what every 2500 suburban/Yukon used. Probably why they seem to have worse fuel economy. I had a same year 6.0 2500 and it felt slow to me from a dig. The 8.1 roasts tires. [/QUOTE]
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Gm Vortec 8.1L?
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