Speed / MPG - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 8 Old 02-17-2019, 02:20 PM Thread Starter
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Speed / MPG

Has anyone ever tried to see what effect speed has on mpg for a Street 750? I went up to Rhyl today (set off with a full tank) went via the A41 cruising at 60 - 70. Did about 102 miles.

Filled up at Rhyl which cost 10.54.

Came back via the M56 / M6 cruising at 85 - 95. Filled up on arrival home which cost 10.62! Didn't seem much difference and the ride back was 2 miles longer!



Can't say that the ride at 90mph was very enjoyable on this relatively naked bike!

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post #2 of 8 Old 02-17-2019, 03:56 PM
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Faster you go the lower your MPG. The faster you roll on the throttle the lower your MPG. If MPG is an issue moped is the way to go. Motorcycles are not about fuel economy.
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post #3 of 8 Old 02-17-2019, 04:23 PM Thread Starter
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Yes I realise that - I was just surprised that cruising at around 20mph faster did not seem to have a detrimental effect on mpg!

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post #4 of 8 Old 02-17-2019, 05:20 PM
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Yes I realise that - I was just surprised that cruising at around 20mph faster did not seem to have a detrimental effect on mpg!

Head wind , tail wind all that comes into play. Weight, you want to see MPG drop add a few pounds that hits it hard. The 750 Street I have with a sidecar on it does well if you ride it like an adult.
Start cranking on it and the fuel is gone. I never really bother to check mileage on any of the bikes . After a few years you know when you are have a bad wind day and fuel stops need to happen more often.
Anther one that drops mileage is cold. Once you start getting below 30 degrees mileage drops.
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post #5 of 8 Old 02-17-2019, 11:19 PM
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If you want to go 90 mph on the street 750, I highly recommend you get the windshield from HD. It doesn't flex or vibrate at 100mph when I tested mine on my 750. As for gas mileage, I get 49-54mpg with the windshield, luggage rack, backrest, center kickstand, engine guard, etc., etc., while maintaining a speed of 55-60mph in 6th gear.
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post #6 of 8 Old 02-19-2019, 10:10 AM
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If you want to go 90 mph on the street 750, I highly recommend you get the windshield from HD. It doesn't flex or vibrate at 100mph when I tested mine on my 750. As for gas mileage, I get 49-54mpg with the windshield, luggage rack, backrest, center kickstand, engine guard, etc., etc., while maintaining a speed of 55-60mph in 6th gear.

Have to agree on the windshield, The cheap junk is not worth it . The HD one attaches as it should.
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post #7 of 8 Old 02-19-2019, 04:48 PM
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20 mph difference will definitely make a big difference in mileage. I would suggest there were other factors at play in why you seemed to get the same mpg; perhaps one way was more uphill and the way back was, therefore, downhill. Or the winds would make a big difference, a headwind one way becomes a tailwind the other.
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post #8 of 8 Old 02-20-2019, 06:30 PM
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The last time I cruised any distance over 80mph the bike only got 33mpg. That was heavily loaded, in a high drag configuration, with a significant crosswind. I would have expected to see your fuel consumption differ significantly, unless as Gaijin says, there were other factors in play.

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