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Old 05-15-2019, 05:04 AM   #1
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Unbelievable fuel milage

I finally burned, what I thought, was enough fuel to check the mileage. Gage read around 3/4 full. I put in 43.1 gallons.
Miles driven was 546 on the trip meter. That indicated I got 12.6 MPG. I don't believe that. I was expecting to get around 7. The trips (3) were not long and about 50/50 between Interstate and state highways. Normally set cruse at 65 on interstate. Engine is CAT 330HP. Coach is 2001 Newmar DS 40'
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Old 05-15-2019, 05:40 AM   #2
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12.6 may be a little high but I think 7 would be a little low for the DP. I'd guess somewhere around 10 for you. I'm sure some of the diesel folks will chime in,.

I record all my fuel and miles. I have a gasser and have seen as low as 4.5 and as high as 11. In both of my cases, it was strong winds, 40 mph tail / head wind, that were the factor for unusually low / high mileage. When we were fighting the strong headwind, I'm sure I could actually see the gas gauge needle moving.. :-(

On our last road trip last winter, over 7,500 miles I average right at 7.0 mpg.
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Old 05-15-2019, 05:56 AM   #3
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run your fuel averages across more tanks.
I think you will end up around 8.
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Old 05-15-2019, 06:06 AM   #4
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The biggest variable is when filling up. Some stations have a slope and pumps cutoff at different back pressures. So you probably didn't completely replace the fuel you used. But a 330 CAT should get more than 7 mpg but not 12 mpg, maybe around 9. On a good day I got 10 mpg from a 275 Cummins but usually closer to 9.
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Old 05-15-2019, 11:02 AM   #5
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My 40’ Country Coach normally gets around 10 to 11. 1998 330 hp 40 series navstar.
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Old 05-15-2019, 01:44 PM   #6
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Is it possible you forgot to reset the trip computer. If that was fill up number two on the that mileage, you would be getting around 7.
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Old 05-15-2019, 02:02 PM   #7
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My , 1999 DSDP , on Freightliner , with two fuel fillers .

For whatever reason , filling the tank from the right side won't completely fill the tank compared to filling from the left , between 7 and 10 gallons .
An issue like that could give you a false high economy figure.
Also if I travel with the lights on my gauge reads 1/4 tank higher than with the lights off .
Several attempts to figure these issues out , to no avail .
Now I ignore them .

Best mileage with continued filling from the left . 9.7 . Overall in 8 years 7.9.
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Old 05-15-2019, 06:28 PM   #8
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I get between 7-8 MPG... And my boat gets 0.8 MPG @ 40mph..
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Old 05-15-2019, 06:42 PM   #9
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Quote:
Originally Posted by hewebb View Post
I finally burned, what I thought, was enough fuel to check the mileage. Gage read around 3/4 full. I put in 43.1 gallons.
Miles driven was 546 on the trip meter. That indicated I got 12.6 MPG. I don't believe that. I was expecting to get around 7. The trips (3) were not long and about 50/50 between Interstate and state highways. Normally set cruse at 65 on interstate. Engine is CAT 330HP. Coach is 2001 Newmar DS 40'
Hahaha you are right it’s unbelievable that’s right. You don’t get a reliable gas mileage reading out of one tank a pump that stops a prematurely you may get 50 mpg and next we hear is that you want a patent or something LOL that’s ok though you got us going, it’s looks like it’s going to rain anyway LOL

Zzotte
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Old 05-15-2019, 06:53 PM   #10
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The last year I've averaged 10.8 - 11.7 mpg. On my last long trip, Central FL to D.C. which was 950 miles each way. I averaged 11.2. Keeping at under 65 mph makes a huge difference. When I did a couple of hours at 68 mph, I could notice a significant change in the fuel needle. I always reset the LCBU and monitor the leg mileage, time, average and instant fuel readings on the LCBU while driving.
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Old 05-15-2019, 08:25 PM   #11
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I agree. Driving around 65mph really makes a BIG difference.
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Old 05-15-2019, 08:43 PM   #12
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I am at a constant 9.5 with a 35' Cummings 275HP pulling a Saturn toad.
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Old 05-15-2019, 08:47 PM   #13
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My Dad once shared a ride to work every day with a neighbor (1960s). The neighbor was bragging about the mileage he was getting in his car. My Dad snuck out every other day or so and dumped a gallon of gas in his tank for about a month.

Maybe someones playing you :-)
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Old 05-15-2019, 09:28 PM   #14
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This pdf makes good reading for all diesel coach owners .

Cummins produced a file with the same results , but I don't have a copy.
Attached Files
File Type: pdf Cat_RV_Performance.pdf (246.3 KB, 6 views)
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