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Old 05-22-2018, 01:48 PM   #1
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I replaced the class C Forester with a class A Mirada. I was told that, while driving, I can run the generator and use the roof A/C for more efficient cooling and better fuel efficiency.
Any knowledge on this subject is extremely appreciated.
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Old 05-22-2018, 02:46 PM   #2
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Probably more cooling simply but don't know about the fuel efficiency.
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Old 05-22-2018, 02:57 PM   #3
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So, is it OK to run the generator and the engine at the same time? And NEVER the generator while connected to shore power?
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Old 05-22-2018, 03:00 PM   #4
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Yes, you can run the generator and run your house AC while traveling. If you shut off the dash AC you'll use slightly less fuel for the engine. However, you'll be using fuel for the generator, somewhere around 1/2 gallon per hour depending on the load.

If you drive 60 mph and get 10 mpg (just for easy calculation), you're using six gallons per hour. If you cut your engine fuel usage by 10% (and you probably won't), you're saving 6/10 of a gallon per hour, about the same as what you're burning in the generator, so the fuel is pretty much of a wash.

Keep in mind that the generator probably requires service after about every 150 hours of use, so you're going to be increasing the maintenance cost for the generator.

You'll have to decide if the perceived savings and comfort are worth it to you.
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