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Old 04-12-2013, 02:56 AM   #1
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MPG Question?

Wondering, what kind of milage I might expect from my engine, 400 SB, '78 Chevy chassis, wgt. 10500 lbs. Class B+ 22 1/2 ft. Probably traveling not much over 60 mph. Coach is a Delta from '79.
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Old 04-12-2013, 03:25 AM   #2
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Probably somewhere in the neighborhood of 8-10mpg.
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Old 04-12-2013, 03:59 PM   #3
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Quote:
Originally Posted by 94-Newmar View Post
Probably somewhere in the neighborhood of 8-10mpg.
X2

cheers
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Old 04-12-2013, 04:11 PM   #4
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A short class B ?? I would say 10+ . Just make sure its tuned up . Our 27' class A averages 12.5-13 mpg at 60-65 mph... 1995 Chevy 350...But it doesn't have a flat nose like most... Just broke the 14mpg mark this trip up and over Flagstaff...
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Old 04-13-2013, 07:12 AM   #5
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If that's a chevy 400 small block with an old quadrajet carb, I'd say 10mpg is about as good as it will do even tuned up. Back in my motorhead days I had several of those engines in a pickup that weighed 5000 lbs, and 10mpg was it. If you can get the quadrajet perfectly tuned, they are a little better for fuel economy than most aftermarket carbs cause they have small primaries and very large secondaries (for when you stomp on it). The issue is getting an old one properly set up. Not always easy.

The 400 was a fun engine... had a good balance between the low end torque of a big block and the higher rpm horsepower of a small block. It should push that rv down the road pretty good.

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Old 04-14-2013, 12:24 AM   #6
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Thanks Piker, I was figuring about 8-10, in that range, :( when I bought it. Have yet to do the fill up milage test. It's a 33 gal. tank. It's a 22 1/2 footer. Not sure on the quad, just know it's a 4bbl. When I head north I will do a fill up. Thx for the reply! Oh, and it does a great job with the power end of pushing it down the road.
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