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Old 10-18-2014, 10:25 AM   #1
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2000 ISB 350 fuel MPG?

Does any one know of a diesel programmer for isb 350 to get better fuel miles per gallon it is 2000 40ft American eagle
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Old 10-18-2014, 11:01 AM   #2
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Does any one know of a diesel programmer for isb 350 to get better fuel miles per gallon it is 2000 40ft American eagle

In 2000 I don't think the ISB was rated at 350. Are you sure it's not a 8.3 ISC? What kind of Milage are you currently experiencing?


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Old 10-18-2014, 11:13 AM   #3
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don't know if there was an isb 350 in 2000, but know an isc 350. over 5000 miles, with pretty much a full load and a light toad, through flat and mountainous (denver) roads, got average 9mpg. it exceeded my expectation.
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Old 10-18-2014, 11:40 AM   #4
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A 2000 Eagle has the Cummins "C" engine, the 8.3L ISC 350. You can get chips for the ISC, but I doubt if you can improve any on the mpg except by easing up on your right foot.
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Old 10-18-2014, 11:49 AM   #5
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I have heard that with your engine using an egg between your shoe and go pedal will do wonders on fuel economy. de Sanford
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Old 10-18-2014, 11:56 AM   #6
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I have heard that with your engine using an egg between your shoe and go pedal will do wonders on fuel economy. de Sanford
if one wants to try this egg thing, make sure the egg is cooked
keeping the speed equal or below 62 mph will do the wonders.
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Old 10-18-2014, 12:02 PM   #7
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As others have stated , your Cummins is probably an ISC; information you can confirm by getting the engine serial number, from the data plate on the timing gear cover and calling Cummins Care.
1-800-343-7357
1-800-Diesels.
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Old 10-19-2014, 08:46 AM   #8
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In 2000 I don't think the ISB was rated at 350. Are you sure it's not a 8.3 ISC? What kind of Milage are you currently experiencing?


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getting around 7.5 mpg & thanks I will call Cummins care with serial
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Old 10-19-2014, 08:50 AM   #9
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Steve I will call Cummins with serial number to find out isb /isc ? Thanks for the reply
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Old 10-19-2014, 08:57 AM   #10
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don't know if there was an isb 350 in 2000, but know an isc 350. over 5000 miles, with pretty much a full load and a light toad, through flat and mountainous (denver) roads, got average 9mpg. it exceeded my expectation.
I wouldm be happy with 9 mpg .getting 7.5 thanks mike.
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Old 10-19-2014, 08:59 AM   #11
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thanks to All who replyed Mike /rethfeo
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Old 10-19-2014, 09:41 AM   #12
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I wouldm be happy with 9 mpg .getting 7.5 thanks mike.

I would say 7.5 is certainly in the "range" of probable mileage for a Cummins ISC. I'm don't know your weight but the American Coach is certainly not a light weight. An ISB in a coach under 26,000 pounds can turn in 9 mpg or greater with careful driving. With an ISC in a coach closer to or over 30,000 pounds it will be more of a challenge.

If you drive for economy you can improve your economy. You really need to invest in a Silverleaf type engine monitor to get the info you need.

1. Target the lowest speed that will keep you in 6th gear over slightly rolling terrain. Your rpm will be within a couple of hundred of the torque peak rpm.
2. You will have to raise your speed somewhat on down grades and allow slowing on the up side.
3. Boost pressure is the enemy of economy. When the engine starts to pull and you see the boost number start to rise, the mpg figure goes in the opposite direction.

Economy is noticeably better in hot weather than cold. Cold air is dense and creates more resistance.
I have a 2003 ISM 500 and running up and down I95 on the east coast, I can achieve 8 to 8.2. Going west toward the high desert that drops to 7 or a little below. If I have a long up grade or major pass then it could be 6-7 for a tank. Coming back east it will be back to over 8. I typically drive 60-62 mph at 1400 rpm.

Consider it a challenge but don't let it drive you nuts. Regardless of what you do the range is likely to be from just under 7 to just over 9.

Safe travels.



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Old 10-19-2014, 09:49 AM   #13
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I agree with all of the posters who say to get the economy from your right foot. If you can get a lower restriction exhaust, that can help get a little better mileage, but knowing how diesel motors work, I have yet to understand or have anyone explain how a "chip" or ECU reprogramming can provide better mileage. Better power, yes, but better mileage, no.
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Old 10-19-2014, 02:55 PM   #14
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7.5 mpg seems a tad low for that coach and year, but just borderline low and highly dependent on you. With careful driving you can probably see 8.5-9 mpg, but it doesn't take much to push it down to the mid-7's. My 2004 with ISL engine gets a bit over 8 cruising the interstates at steady 62 mph, but drops immediately to 7.1-7.6 in most any other circumstances. City driving knocks it right down into the low 6's.

If you haven't yet cruised for a couple hours at modest speed, without stop & go, don't start worrying about mpg yet. The 7.5 is fairly typical of a big coach in routine driving.
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