MPG decreasing

[mininsx_imp]

Winter blend gasoline has slightly different distillation specs and there's more butane added in winter, but it shouldn't have made that much of a difference. "White Dog" may be onto something, because if you've changed to an ethanol blend then your mileage will go down. Personally, I've never gotten below 48 MPG and it's usually around 50-51.

[pdedse]

When I was a sportster owner, most riders claimed 45-50mpg, and mine was always within that range, maybe a bit more, rarely less unless strong headwinds.

Hard to measure, but it seems to me the disparities among CB1100 riders is greater, maybe 39-55. I mean, there are the obvious factors such as riding style and city vs. hiway riding, but I'm wondering if those who never get lower 50mph are living better than I am or what. With a mix of riding, I seem to get no better than 45mpg (I weigh 180lbs). If mainly city it will drop to 41,42. If only hiway even with luggage, 50mpg like on a recent extended trip. Once I got over 55...coming down a long, long mountain pass. But normal for me is 43-44. I don't wind it up much or ride aggressively. But I do live in a hilly area in Oregon, mine is a 14 stdr. But in the end, I didn't buy it for it's freakishly good gas mileage...I have my bicycle for that.

[Wisedrum]

My 2013 5 gear model consumes averagely 4,7l/100km
over a distance of 31.000km driven all over the year.
Many of these during autumn, spring and summer. Some in wintertime. Of course the fuel consumption is rising as the temperature is falling. Not only with the Honda but also with the W and the Prius 4. Don't know,
if it has something to do with the altered gasoline that is offered in colder periods, if so. Don't think so. It is in my opion more a tribute to the fact, that each part of the vehicle takes more time to warm up and run efficiencly. Besides, assumed that everything is allright with the mantainance parts of the bike or car and they are in a good shape.

Wisedrum

[flynrider]

Mine gets anywhere between 40 and 59 mpg. It depends entirely on how I ride it. I have a pretty heavy wrist in the city and make good use of the CB's brisk acceleration. If I get better than 40 mpg on a tank of city driving, I'm surprised. At the other end of the scale is leisurely back road riding. On 55-65 mph roads, mid to high 50s is normal.

So far, I haven't really been surprised at the gas pump. If you have a heavy wrist, mileage could go down in colder weather since the denser air allows the engine to deliver more horsepower (and less mileage) when you crank that throttle open.

[LongRanger_imp]

Fuel efficiency improves with elevation. I rarely ride below 7,000'. Along with low-60's on my CB1100, my F800GT averages 70 mpg and my ex-CBR250R never got less than 90 mpg.

[rboe]

I got into the mid 30's on a trip to Death Valley last year - dang wind. My money is on the gas blend changing. That said, dirty air filter can do you in too.

[memphismike_imp]

Appreciate the input. Going to monitor it closely and see what I come up with.


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Have you recently changed from 100% gas to ethanol-laced gas?

No I am running ethanol gas in the CB. My Shadow I run non ethanol as it sits quite a bit tho.


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[satchit]

One thing I have noticed is that at lower temperatures(<40F) the engine seems to idle at a higher speed(~2000 rpm) for the first 5 or 6 minutes after first start up. I think this is for the oil or the O2 sensor to reach operating temperature.

My MPG decreased last winter too - I'm guessing it is because of the higher idle speed and the winter blend.

[uscgmac_imp]

Could be lots of things. Type of gas, dirty air filter, plugs, tire inflation, riding style and changes, change in temperature and so on. Many factors, could be environmental or mechanical. I've owned my bike almost two years and I think I've checked the miles per gallon maybe twice. The way I ride is not going to ever give me optimal gas milage. I like spirited riding and quite often.

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[4 Paws_imp]

My seat of pants dyno doesn't detect a performance difference between ethanol and non ethanol fuel, don't recall any mpg difference either.

If my mpg dropped about 20% overnight I'd be checking everything y'all could suggest.