Fuel Mileage on your Diplomat with an ISC Engine

[BIGRED1]

I was wondering if there's anyone else out there with a Diplomat with the 8.3L 315HP ISC engine and what kind of fuel mileage you're getting at various speeds. TIA!

[BIGRED1]

I was wondering if there's anyone else out there with a Diplomat with the 8.3L 315HP ISC engine and what kind of fuel mileage you're getting at various speeds. TIA!

[The Shadow]

I'm close I guess. 330/950 ISC. Travelling at 60 to 65 we are getting 7.6 MPG. We tow a Colorado behind a 40PLQ.

Don

[ronboc]

For comparison ...

'06 ISL (400/1250) with 9.5k miles, and we get about 8-8.5mpg at 60-62, pulling a Wrangler.

I keep hearing these things 'start' loosening-up at 20-30k miles. Can't wait to see that!

HTH,
Ron

[mayahuel]

Bigred1. We have an o3 HR Endeavor with the cummins ISC 330/950. We are towing a 4wd Dodge Dakota (5300 lbs). With 39,000 miles we are averaging 8.6 mpg. Our coach (and I) like 64 mph on the freeway. Hope this is helpful.

[BIGRED1]

Thanks everyone! I was looking for something to compare with. I just got a Silverleaf VMSpc system from my coach, so I should be able to start accurately tracking and logging my fuel consumption.