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Old 09-27-2020, 02:32 PM   #1
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Join Date: May 2018
Location: La Luz, NM.
Posts: 79
ISL 425 performaance?

Anyone have personal experience with what I can expect in the way of performance or fuel mileage in a 2008 Horizon 40 AD Cummins ISL 425
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Old 09-27-2020, 05:23 PM   #2
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It would be the same as my 2007 Ellipse, 7-7.5 mpg pulling a 3500 lb Jeep.
It weighed about 35,000 with the Jeep
It had a 400 ISL

Less in mountains, heat, wind, and rain.
More when cool, no wind,

My new 450 ISL gets about 6.8 - 7.4. Depending on weather and hills
It weights 43,000 lbs with the Jeep
I just came back from a 2200 mike trip I Avg about 7.4 but it was nice all the way. No weather, not hot. Kept it at 63-64 mph.
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2020 Horizon 42 Q, 450 ISL
2007 Itasca Ellipse 40 FD, 400 ISL
2004 Southwind 32 VS, 1999 Fleetwood Storm 30H
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