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Old 07-22-2018, 01:34 PM   #1
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Fuel Mileage

I have a 2010 Tiffin 36' Allegro Red new to me that I just picked up a few weeks ago. I was wondering if anyone happens to know what I can expect for fuel performance. I have less than 300 miles on the first tank and its down below a quarter. I would have thought I would have gotten more like 7 or 800 on a tank.. At least that's what the sales man said when I asked him. I am new as this is the very first RV that I have ever owned. I did use the generator for about 25 hours in preparation of the two trips we took. Does the generator use much desal fuel?
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Old 07-22-2018, 01:41 PM   #2
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The generator will use about 0.5-1.0 gallon per hour of diesel depending on load.

What size is your diesel tank? I would think that you could get 8.5-9.5 mpg out of your unit.

What engine do you have? Cummins?

(nice looking coach by the way)

Mark
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Old 07-22-2018, 01:41 PM   #3
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Your first mistake was believing anything the salesman said!
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Old 07-22-2018, 01:43 PM   #4
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Originally Posted by Mr.Mark View Post
The generator will use about 0.5-1.0 gallon per hour of diesel depending on load.

What size is your diesel tank? I would think that you could get 8.5-9.5 mpg out of your unit.

What engine do you have? Cummins?

(nice looking coach by the way)

Mark
We have a Cummins and it has a 100 gallon tank.
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Old 07-22-2018, 01:50 PM   #5
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What size/hp engine do you have?
What length/weight is your coach
What terrain were you in? Flat or hilly?
We’re you towing anything? If so how heavy is it?
Did you have a head wind?
How fast were you going? Anything over 60-62mpg and you will really start to suck fuel. It’s a brick driving through the air/wind.

All of this will make a difference. Is your tailpipe really black with soot? Maybe your engine is using too much fuel and not burning all of it.

Need more info
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Old 07-22-2018, 01:54 PM   #6
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Congrats on the new rig! We average about 8 MPG on our Windsor with a Cummins ISC350 engine. Keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 07-22-2018, 02:05 PM   #7
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I wouldn't believe anything a salesman said. I wouldn't believe the onboard computer either. But I do believe math. Fill it up, write down the odometer reading and the generator time, drive alot, fill it again to the same level-ish, note the odometer and genetator again, figure about .75 gallon for each hour of generator, subtract out the generator fuel, put miles traveled over remaining fuel burned. Do this ten times and you have something to believe in. BOOM!
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Old 07-22-2018, 02:05 PM   #8
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The second thing you should not believe is the fuel gauge. Our 2011 Phaeton was so far off it was laughable. When our current gauge is @1/4, I still have 75 gallons of the 150 gallon capacity left. Sometimes when I fill it, it will register 3/4 full. The only thing you can believe is the miles driven divided by the gallons used over several tanks. I will subtract 1/2 gallon for each hour the generator runs to get closer to what the engine used.
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Old 07-22-2018, 02:07 PM   #9
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I bet: If you drive 75 and pull a Subnurban, look at 6.5. If you drive 70 and pull a Jeep, look at 8.5. If you drive 65 and pull nothing, maybe 10.
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Old 07-22-2018, 02:16 PM   #10
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I recalibrate my Freightliner diesel tank gauge. It was off by 1/8 tank. Would never show full. Took off the bezel and put in a new stop at the low end so it reads very correctly now.
I get 8.9 mpg over last 30k miles.
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Old 07-22-2018, 02:46 PM   #11
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If you can afford to pay for the rv gas mileage and cost of gas should. be the least of concerns enjoy enjoy enjoy
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Old 07-22-2018, 04:53 PM   #12
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If you can afford to pay for the rv gas mileage and cost of gas should. be the least of concerns enjoy enjoy enjoy


Mileage times number of gallons equals range. Important to know if your traveling where fueling stations are few and far between.
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Old 07-22-2018, 04:57 PM   #13
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If you can afford to pay for the rv gas mileage and cost of gas should. be the least of concerns enjoy enjoy enjoy
Really?? lol

Anyway, like others have said, The gauges on these things are notoriously inaccurate. For example, I can put 100 dollars of fuel in mine, and it shows 1/4-1/3 full. BUT... add another 25-30 dollars in it, and the gauge jumps to 2/3.

Fill the tank until it stops filling. Drive a hundred miles and then fill it until it stops again. THAT will give you an almost perfect idea of your fuel economy.
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Old 07-22-2018, 06:18 PM   #14
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It will take 4-5 fill ups keeping accurate generator time X.75 gallons/ hour before you can tell your mpg. Filling a little out of level can change as much as 15 gallons difference + or -.

I had a good tailwind today so gained almost 1mpg.
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