MPG

[A10Boy]

What speedo have you got fitted, if its from the wrong model it could be reading wrong for your Rocket.
Do your trousers get wet when you ride it? 

[franknjan]

I've recently bought an A10 and I wanted to know what the fuel range of a full tank is.
The bike is fitted with a mikuni carburetor, but otherwise standard.
With a full tank, I covered 220 mls, not in one journey, at normal riding speeds. I switched over to reserve and continued until I  completely ran out of fuel (I had spare fuel with me) from switching to reserve, I covered 13 mls.
I doubt I will ever get to situation where I would run out of fuel, but at least I know what could be available.
My next test will be a MPG test over a good distance.
Hope this helps others who don't know the fuel range.

[CheeserBeezer]

I have a couple of bikes with Mikuni carbs. Both are quite frugal compared to Amal

[muskrat]

G'day Frank 
You don't say whether your A10 is a plunger or swingarm (different gearing). The std s/a tank is 4 Imperial gallons. If your getting 233 miles out of the tank it's 58mph.
Now get over to Intro's and give us your story please.
Cheers

[bikerboy]

I have to be honest if I dropped below 50mpg on one of my A10's I would be extremely disappointed. I will add that two of them are Super Rocket spec with twin carbs and I am not exactly well known for holding back on the twist grip 

Even my plunger has an SR head on it albeit single carb and that hits at least 65 or 70mpg. To be fair I dont cane that like I do the other two 

[Yeti]

My super rocket usually gives 60 mpg in brisk use. best was 90mpg+ following a friend with a knackered old triumph which struggled to reach 50 Mph. That was a fun 150 mile trip!!

[muskrat]

I have to be honest if I dropped below 50mpg on one of my A10's I would be extremely disappointed. I will add that two of them are Super Rocket spec with twin carbs and I am not exactly well known for holding back on the twist grip 

Even my plunger has an SR head on it albeit single carb and that hits at least 65 or 70mpg. To be fair I dont cane that like I do the other two 

G'day BB.
My brother from another mother!
Cheers

[Slymo]

I think that simple physics is rather heavily involved. Energy required for work done. I seem to get around 50-60 mpg out of any machine I ride depending on average speed. I've done a 400 mile trip from Auckland to Wellington on a 860GT Ducati a B44 BSA and the 58 Super Rocket. I've also done quite long journeys on a V50 Moto Guzzi Monza. None of them exceeded 60mpg because hauling my carcass through the air takes that much energy. All were running mushroom coloured plugs and had well inflated tyres. My mate borrowed a Suzuki 250 four cylinder bike which he rode from Melbourne to Adelaide. Astounding performance for a tiny motor singing along at well over 10,000 rpm but the fuel consumption was 50mpg. 

[Lindsay S]

I filled my ‘58 Flash up to the brim 132 miles ago and did the same again today, putting in 8.69 litres. By my calculations, that comes to 69.1 miles to the gallon. 82 miles of the 132 were two-up and we were following a guy on a Harley Street Glide who, incidentally, reckoned on getting 40 something mpg!
My bike is bog-standard but appears to have a later (iron head) engine with 1 1/8” inlet tract and thus, a 389 monobloc. Jetting and slide are ‘by the book’.

[groily]

I reckon that's pretty decent Lindsay.
With the same later iron head as yours, with the same book-settings 389, and flat top pistons, I usually managed somewhere in the mid 60's mpg, but could squeeze close to 70mpg if running gently. I weigh quite a lot and present a more challenging profile than you do (as you know!) so I was always pretty pleased with the A's economy. When exercised a bit, she'd still do 55+mpg.
My local mate her current owner regularly runs her in the 70mph range with bursts to 80+ omigawd (I never did much of that, 60-65 were enough!), and reports the metric equivalent of 55mpg too.
His fuel costs will no doubt pale by comparison with his engine overhaul costs in due course, but she's been run quite hard for several years now and nothing bad has happened. Yet. Those IMG pistons I stuffed in prior to passing her on seem to be doing a good job!
Luckily, my said mate is very well-equipped to fix it when it goes bang one day as classic repairs and restoration are his game.

[Worty]

Roughly 55mpg for me, but I do give the old gal a bit of a pasting at times.