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First observation of Street Twin's fuel mileage

17K views 45 replies 29 participants last post by  ThePuneetMishra 
#1 · (Edited)
After 2 hours of riding through country roads at an average speed of 60-70 mph, the speedometer instrument showed 55 miles per gallon for fuel consumption at that speed. I think a ride of 45-50 mph would certainly see the fuel economy climb close to the advertised 70 mph. Impressive. Also, the speedometer's digitized fuel gauge, indication of miles ridden, miles remaining, and bright yellow low fuel light were all welcome additions.
 
#3 ·
If it's anything like my M796, the display is USA in the ECM. EC bikes are probably flashed EU in km I'd imagine. UK bikes might have a Mile option in the menu. Would probably express it in liters though as the UK pumps are in liters, right?
 
#4 ·
They've taken the differences into account on the website's mileage claim.

For the UK and Europe the mileage is reckoned to be 76 UK mpg or 3.1 Litres/100km.

For the US models the mileage is 60.8 US mpg.

If they can be achieved then it'll be remarkable, specially as I've never been able to better 54 UK mpg on my twin and I'm a sedate rider.
 
#6 ·
I would imagine the mpg will improve with age, so that by 5000 miles perhaps returning an extra 3 - 5 mph. Overall though, the mpg is not much better than my carb t100, which returns 60mph at 70mph. My old Mag Efi would return 65mpg at 70mph. Pity the ST tank is not 3.5 gallons.
 
#10 ·
Wow. Lucky you for both bikes, That's way higher (about 15 mpg) than my '06 at the speeds you noted.
 
#12 ·
Personally I have NEVER found a miles per gallon readout in any car or truck to be accurate, so I would expect those in motorcycles to be the same. Generally when someone is extolling the awesome mileage their vehicle is delivering I asked them if they ever calculated the MPG's themselves, and I've urged them to do it for a few tanks. Whenever they did they came back "disappointed" that the actual calculation showed a lot less (typically 4-5 miles per gallon less, the worst was off by 7 - and yes, certain manufacturers seem to be consistently farther off than others). The readouts always claim you are getting more miles per gallon than you really were ... hmmmm, I can't imagine that the manufacturers would actually LIE about it. The most accurate I've found is in my '08 Subaru, and while the result varies from tank to tank the average amount it is "off" is only about 1 mile per gallon on each tank. So I would definitely take any mileage figure from a readout with a grain of salt.
 
#13 ·
Just to reassure you - my T100 has an analogue speedo, with trip meter. So, I pull in, fill up, check mileage, enter mileage into smartphone, divide by litres entered into tank, multiply by 4.5 (litres per gallon, UK), take reading, enter into smartphone. The good thing about the carb bikes is that they have dinosaur technology, not digital readouts. The question is - is the trip meter accurate? Dunno
 
#14 ·
I agree about "on board" mileage calculations from the engine management computer. My Honda Fit reads 5 to 6 mpg high on a fairly consistent basis. My Town & Country reads 2 mpg high routinely. I haven't checked my Street Triple for accuracy but I'm pretty sure it's optimistic. My T100 generally delivers 45 to 47 mpg (US gallons) when driven briskly (but in some rational fashion) over two-lane back roads. That's based on trip odometer and fuel added to the tank. I have not checked the trip odometer(s).

I always have to laugh when somebody tells me that his/her "Brand X" car delivers 50 mpg on long trips. If I ask how that was calculated, the response I get is that it's from the on-board system but these folks are pretty sure it's "accurate."
 
#15 ·
The on board system in my Honda Fit will often tell me I could get around 370 miles to the tank upon fill-up. As the tank nears empty, it normally changes to the more accurate 290-320 m miles per tank (depending on driving style). It also gives me a generous MPG reading (it actually claimed 50 MPG once!). I normally just use the readings to decide when I should get fuel.

I used to keep track of my car and moto using the Fuelly app.
 
#30 ·
I've done 500miles of mixed , town and twisty minor roads , mostly with my wife as pilion...according to the computer its never gone below 63 mpg at the end of a ride , curently showing 67 from the last fill up/ trip reset
Have you tried computing it from miles travelled and gallons used, instead of what the trip computer says? I'd be curious...

-Dan
 
#34 ·
I just passed 1,000 miles on my ST and have been between 51 and 54 mpg. My daily commute is 50 miles each way with 35 on highway and 15 on suburban 4 lanes with many lights. I zero out the mpg reading after each tank and find it has been fairly accurate. The most miles on a tank has been 164 with a couple tenths left in the tank.
 
#36 ·
After 586 miles on my T120 I am averaging 51 mpg (hand calculated) and the computer showing 52.5 mpg. My last fill-up I reset the computer on the bike and will see how it differs when I re-fill the tank.

I did a 340 mile ride on Saturday and during one section I was doing a steady 60 mph in traffic in 6th gear, on flat roads with no wind. The computer was showing a steady 70 mpg in 6th gear (about 2,600 rpm). So in theory you should be able to get more than 250 miles (266 actually) out of a tank if you took it real easy. But personally, I would go a little faster and stop more often than every 4 hours. Personally I think the bike feels more comfortable at 3,000rpm which is about 70 mph in 6th.

Han
 
#39 ·
reset the trip , filled up , did 135 miles and bike was saying 65.7mpg. I filled up with 9.4 litres , which equates to 2.07 UK gallons ..so thats 65.2 mpg ...the computer is correct as you'd expect , it should now how much fuel its injecting after all.
What was your average speed (in mph)?
 
#41 ·
Havent a clue Scrambler , it was done over 2 journeys , both of which were broken up with stops. My riding has been described as spirited and I only use twisty british A and B roads. I did hit 80mph on the B184 near Dunmow:grin2:


I'm getting 55-56 mpg on my bike after a full-day of country road riding at a near constant 70-75 mph. Perhaps your higher fuel mileage is due to riding a bit slower?
 
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