Tank Capacity and Range - KTM Duke 390 Forum
 
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post #1 of 5 Old 04-14-2019, 09:31 PM Thread Starter
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Tank Capacity and Range

Posted in "engine" cuz it is fuel, ya know?

I did a 510km ride today and specifically wanted to test the actual range of the Duke and the capacity of the fuel tank. This was a gentle ride, speeds between 70kph and 110 kph but more on the slower side. Twisty hilly East Coast back roads. All paved. This is important because back in 09-05-2018 I established that Duke fuel mileage varies wildly with speed. I did some reconfirmation of this today.

This is in preparation for a trip across Labrador where I have 410 kms between fuel stops. I need to know.
Running a fuel injected engine to empty is bad for many reasons, especially fuel pump life.
Or my life in Labrador.

So here is the fuel economy data from 09-05-2018: 390 Duke 2018 fuel mileages at speed:
mph mpg Kph L/100km
20 120 30 2
25 115 40 2.1
30 110 50 2.2
40 98 60 2.4
45 90 70 2.6
50 85 80 2.8
55 80 90 3
60 70 100 3.4
70 60 110 3.9
75 55 120 4.3
80 50 130 4.7
85 40 140 5.9
90 30 150 7.8
95 20 155 12



So today
262 kms low fuel light came on
288 kms gauge started blinking red
332 kms bike suddenly died. Tipping bike to either side gained 2 kms.
Filled with 5L from a can. Rode ~10kms and was able to put 8.1L into the tank.
Looks like 13L capacity to me.
Figures out to 3.9 L/100kms or 25.5 kms/L or about 60mpg(us). Not great for a small bike.

On the ride home I had clear sailing on high speed highway.
Low fuel light came on at 158 kms or roughly 100 miles.
Your mileage may vary...

2018 390 Duke with knobbies
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post #2 of 5 Old 04-15-2019, 04:18 PM
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I get roughly around 250-300km per tank on my RC390.

it varies with riding style, temps, traffic etc, but its in that area.

I often see between 2.4 and 2.8 l/100km on my dash while riding at steady speeds.

I don't go at hiway speeds much, but its similar at about 105km/hr

I don't have knobby tires, or luggage racks etc, so I am assuming that might help.

'18 RC390
Delkevic Exhaust
Rapidbike Evo
pedals/levers
fully open airbox
weight removal
R6 rear shock
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post #3 of 5 Old 04-15-2019, 04:51 PM
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Thanks for the info!

A few day ago I rode at "155/160Km/h" and made 80kms with 3/4 fuel tank. I wanted to see the final speed of my babe.
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post #4 of 5 Old 04-15-2019, 07:27 PM Thread Starter
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Quote:
Originally Posted by John390 View Post
I get roughly around 250-300km per tank on my RC390.

it varies with riding style, temps, traffic etc, but its in that area.

I often see between 2.4 and 2.8 l/100km on my dash while riding at steady speeds.

I don't go at hiway speeds much, but its similar at about 105km/hr

I don't have knobby tires, or luggage racks etc, so I am assuming that might help.

The RC390 is significantly more slippery than the Duke, especially a Duke with panniers, weight and a windshield.
I have the knobbies off now, which really helps mileage, handling and rolling resistance.
I will be running them in Labrador and I'll probably have another 20 lbs more weigh, so I'll have to factor some Kentucky windage on the final mileage.

The 2.4 and 2.8 l/100km on the steady run is great, but the cold start up, idling, accelerations and hill climbs really kick the sheet out of the final average. A little joyful enthusiasm with the throttle can put a big dent in the final number. Most of the time I pays my money and takes my thrills, but I gotta learn to make mileage between the long gas stops.

2018 390 Duke with knobbies
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post #5 of 5 Old 04-16-2019, 03:48 AM
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The engine in this bike is tuned for performance over economy. You could probably get more fuel range at the expense of less power.
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