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Old 07-27-2011, 10:10 PM   #43
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Originally Posted by Coma

Math is good. Really, it is a single data point on one trip and I think you make the point that a lot more data is needed. I like the spread sheet idea. It makes me hopeful that long term average will be closer to 9 than to 6.

In general, although there is much difference between drive trains the most difference is in driver technique. The driver is the single biggest factor in fuel mileage or lack thereof. Speed is one factor, of course, but other things come into play. I use the boost gauge to tell how much I am fueling. Unless higher needed I use about 15" to accelerate. I maximize cruise control use when ever possible and I have used econo mode. I would be interested in hearing others driving tips.
Will you explain what the "economic mode" is suppose to do?

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Old 07-27-2011, 10:24 PM   #44
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Originally Posted by Danodaman View Post
Will you explain what the "economic mode" is suppose to do?
The "economy" mode changes the shift points by 200 rpm under heavy throttle and also keeps the engine in a higher gear longer. It mainly helps in hilly areas where the trans is hunting back and forth. I normally have it on since I put the Banks kit on as the torque curve is much higher and longer now.

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Old 07-28-2011, 09:41 AM   #45
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I have a new-to-me 1997 Beaver Marquis with a 425 hp Cat C12 engine. The documentation I got with the coach was very limited. I have nothing on engine performance. Called a local Cat dealer and asked what the peak torque RPM was. He told me to bring in my engine serial number and he would tell me everything about that particular engine. What a bunch of data I now have. Much of it i don't understand. He pointed out the data that was most useful for an owner. I now know the fuel consumption at various engine RPMs which tells me my most economical operating range.

There is no point to this post except you may want to get this information on your particular engine from a dealer no mater the make or model. The data clearly indicates the lower the RPM the better the MPG. This is pretty obvious. If you know the peak torque RPM and operate there, that is all you can do. You have no control of road or weather conditions or drive train gearing. IMO, using cruise in mode at an engine RPM at peak torque is the way to drive if you want maximum economy.

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