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Old 11-08-2011, 05:45 PM   #1
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1990 winnebago mpg

we have a 1990 28' cheiftain. how much fuel will it hold? what kind of fuel mpg should i expect. big block chevy. fuel inj. no toad.
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Old 11-08-2011, 06:15 PM   #2
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mpg

we have a 1990 28' cheiftain. what fuel mpg is normal? 454 chevy fuel inj. no toad
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Old 11-08-2011, 06:17 PM   #3
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I'm guessing that is throttle body injection into a carb? I don't think the Chevy 454 of that era had sequential or direct injection. So my guess is under 8 mpg, and maybe as little as 6 mpg. But i have no expereince with that chassis to back that up.
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Old 11-08-2011, 06:53 PM   #4
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When people ask what my mpg's are, I usually say that I burn around $40. per hour. It's a compromise I can live with, it's about 3 times more than my Jeep... I have recently experienced how driving 60-70mph as opposed to 70-80 will save you around $8 per hour.
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Old 11-08-2011, 07:00 PM   #5
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6 to 8 mpg would be about right
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Old 11-08-2011, 07:42 PM   #6
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It's somewhat about your aerodynamics and a lot about your driving habits.
In time you'll find the sweet spot speed where you get your best mileage. But hard to imagine that will be over 10 if that.
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Old 11-09-2011, 12:49 PM   #7
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I have an 87 Allegro 33' with the 454 and weigh 14K. I get about 5.5 and I don't drive fast. I will be having a new carb put on this year to try and get to 7 or 8, but I don't expect much improvement. If you have had it tuned and your weight (which it is) less than mine I would think you should get 8 to 9. On the gas tank size I would say either 75 or 80 gallons. The previous owner of mine change mine to a 120 gallon tank.
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Old 11-09-2011, 03:33 PM   #8
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mpg

thanks guys , just testing the water to see if im in the game. i mostly pull our harley roadking behind moho. mpg around 6 mpg.
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Old 11-10-2011, 07:55 PM   #9
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im sorry dut a class a or c i pull close to 6000 lbs around with a 454 no wind 8 but it drops
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Old 11-13-2011, 08:51 PM   #10
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I recently did some work on our '88 Itasca 24" with a carburated 454. This included a carb rebuild, new radiator, fan clutch, thermostat.
So now the fan is not coming on until the thermostat has already opened, rather than the thermostat and fan fighting each other. Carb is working great.
But I think the biggest aid to better fuel mileage was the vacuum gauge I hooked up. If you watch the vac gauge and try to keep the reading as high as possible this will make a couple miles per gallon difference.
My last trip a month ago was almost exactly 2 mpg better than the same trip a year ago.
The vac gauge will inform you with the reading of the position of the throttle plates in the carb. If the throttle is near wide open, then there is very little vac on the gauge. When climbing a mountain better mpg is doable by downshifting and backing out of the throttle some. Sure, you get to the top slower, but I think it is a good trade. The vac gauge can also tell you when your speed on the flat is costing you mpg.

The last trip was about 7.3mpg climbing the mountains, about 10.2 mpg coming back down. I was pulling a loaded utility trailer both directions.
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Old 11-13-2011, 10:18 PM   #11
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best bet is to do some ingnition work, headers, x-pipe and bigger exhaust, and carb work. guys who are doing this are getting around 10 mpg. there are post by jim elliot about it on here.

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