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Old 10-21-2012, 07:19 AM   #1
civhatch90 OP
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Location: NJ
Oddometer: 127
The airhead gas mileage thread.

I know we do not have these bikes because of great gas mileage but just curious, what kind of mpgs are you guys getting?

List model/year/mods.
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Old 10-21-2012, 08:03 AM   #2
Mark Manley
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Location: Back home in the UK
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I am a fairly steady rider, cruise at 60 mph, rarely accelerate hard and both my '83 80 G/S and '91 80 GS usually give me about 50 mpg imperial gallons that is 40 mpg US gallons. The best I have had from both is about 55/44 on a steady run and down to 40/32 in difficult conditions into a very strong headwind.
I do get more than most of my friends who have airheads and the same with tyres, about 10,000 from a rear, 15,000 from a front.
Something I find that makes a big difference is carb condition, I rebuild them every 50,000 miles with new jets, needles and lap the choke discs which gives another 3-4 mpg, the figures given are after a carb overhaul.
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Old 10-21-2012, 10:27 AM   #3
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Location: Lincolnshire, England
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I have a 1979 r100rs but have removed the fairing. Ride fully loaded and 2 up. Steadily cruising all day not accelerating hard we consistently get between 45 - 50 mpg (imperial), we can squeeze out more but that is typical for us.

As an aside sitting at around 3,000 rpm in top gear or speedo shows us cruising at 70mph... We don't go much faster than that. the indicated 70 in reality equates to about 55 though. My final drive is 33/11...

Our engine oil consumption is somewhere about 1litre every 1500 miles.
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Old 10-21-2012, 10:31 AM   #4
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Location: Muskegon, Michigan
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I have had 4 different airheads and have never seen 45mpg.

'79 R100S, '74 R90S, '81 R80G/S, '74 R90/6

Currently on the unfaired R90/6 I average ~38mpg

I have previously had an F650GS that I could get 60+ mpg out of

And on a Buell Ulysses I averaged high 30's, but did get 50+ on one particular trip

I think I could get better mpg on airheads if I didn't like twisting the throttle so much :)
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Old 10-21-2012, 10:35 AM   #5
Joined: Jun 2012
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sort of goes without saying that for most of us airheads are more about smiles per gallon than mpgs.

awww.. anyway.. 1978 R100/7 with 32mm CV bings, I got 40mpg on the dot, no matter how or where I ride, two up, fully loaded, solo, or not. Oil consumption about 1500miles/liter as well, but I had a number of leaks I just fixed, and now I know not to fill the the max line. Overhauled my carbs, maybe that'll bring my mileage up a bit.
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Old 10-21-2012, 10:38 AM   #6
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There's a whole section devoted to airheads in Oldscool,its all there to avoid clutter here.
Some bikes around at times
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Old 10-21-2012, 10:38 AM   #7
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i am not sure of the mpg as i just work out the miles per tank on all my bikes
suzuki gsxr 600 srad sound fun bike
bmw r100gs i sold as it be came to unreliable.
road legal stomp pitbike sold
Klr 650 the worst ever made
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Old 10-21-2012, 01:17 PM   #8
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I used to get ~45 out of an R80, and ~42 out of an R100 .... once they're dialed in*. Currently, I'm getting ~38 on my '91 R100GS, but In the ~200 miles to a tank, I'm putting about ~20 of 'dirt riding' ... that seems to decrease my mpg .

* I am a conservative rider. Both bikes had Mikuni carbs, set up by Stan the original owner of Rocky Point Cycles. Both bikes 'set up' only entailed moving the needle a bit leaner.
'85 R80RT G/Sified <|> '73 R75/5 LWB
Simply Simple and getting more so.
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Old 10-21-2012, 02:09 PM   #9
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36-44 mpg (US) out of my 1985 R80RT. Worst of 32, best of 48. I usually run between 65 and 80 true mph on the freeway, which will deliver around 38 mpg. The bike is in pretty good shape but with 40,000 miles on it the carb needles and jets are probably worn. I also have never had the enricheners apart for any sort of PM. The 85 has lower compression than earlier examples which will negatively impact both max HP and fuel economy. I'm not sure if the compression reduction is due to the pistons or the head so I have no idea whether there is an easy way to increase it.
MSF Ridercoach IBA: 35353 95 R1100GSA, 93 GTS1000, 85 R80RT, 93 DR350/435, 99 RX125, 78 DT100
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Old 10-21-2012, 02:13 PM   #10
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1983 R80 G/S... stock... normally around 42 MPG
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Old 10-21-2012, 02:16 PM   #11
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Location: San Francisco Bay area
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'92 R100: 21-42mpg

'83 R65: 25-39mpg

'69 R69S 19-38mpg
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Old 10-21-2012, 02:23 PM   #12
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Usually around 40mpg, although I swear I got 59mpg on a tank on my R90 in 2009.

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Old 10-21-2012, 02:41 PM   #13
Joined: Dec 2011
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I suppose I average 35 or 37 on my '94 R100R - mostly a ten mile freeway commute.
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Old 10-21-2012, 03:48 PM   #14
Joined: Aug 2010
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45mpg on the r100r, usually loaded and two up. On my r100/7, I can squeeze out 50mpg.
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Old 10-21-2012, 04:13 PM   #15
Joined: Sep 2007
Location: Dublin
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Fairly energetic riding of my 90 R100GS has consistently delivered 45 miles per Imperial gallon. A recent clean and balance of the carbs and it is now returning 44mpg.
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