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How Accurate?
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The ferret Offline
Forum Moderator

Ohio
Posts: 31,282
Joined: Apr 2013
Post: #1
How Accurate?
Pulled in to get gas with last bar blinking

It was showing 39 miles remaining

İmage

Toggled to B and it said I had gone 207.3 miles on this tank

İmage

toggled again it said I averaged 55.8 mpg on this tank

İmage

toggled again and it said I had used 3.7 gals gas

İmage

filled it up as normal to the bottom of the neck

İmage

turned around and checked the pump and I had put in 3.69 gallons of gas

İmage

With calculator 207.3 miles divided by 3.69 gals = 56.1 mpg (computer said 55.8)
Fuel pump said I filled up with 3.69 gallons of gas (computer said I used 3.7)

That's pretty darn accurate if you ask me

(still had approx .9 gallon of gas in the tank I am assuming for a 4.6 gallon tank or about 49 miles at 55 mpg... computer said 39 miles left)

.
Defender of the Realm
2014 DLX (the pleasure horse)
2021 NC750X DCT (Angry Bird)
04-20-2018 11:36 AM
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johnf514 Offline
1st Service Completed

Orlando
Posts: 206
Joined: Jun 2016
Post: #2
RE: How Accurate?
I would kill for this kind of mileage. Lots of city riding and heavy throttle nets me ~40mpg if I'm lucky. Sometimes I'm on my last bar before 100 miles.

I've seen as high as 185 miles on my 2014ex. Tank was nearly bone dry, not sure how I managed to make it home.
04-20-2018 12:34 PM
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cookiemech Offline
Running Like a Top

West Newton, Pennsylvania
Posts: 256
Joined: Dec 2017
Post: #3
RE: How Accurate?
I have not yet had a tank below 50 mpg on my 2017 EX at about 1100 miles total. Last tank was 56 mpg (calculated, not indicated).

Fantastic efficiency, I'd say.

1982 BMW R100T, 1994 BMW K75RT, 1995 BMW K75/3, 2005 Harley-Davidson Sportster Roadster, 2015 BMW R1200RT, 2017 Harley-Davidson Road King, 2017 Honda CB1100 EX, 2020 Ural Gear Up, 2022 Triumph T120 "Gold Line"
04-20-2018 01:06 PM
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jdinaz Offline
1st Service Completed

Arizona
Posts: 116
Joined: Oct 2017
Post: #4
RE: How Accurate?
That's good info, cruising around town (not much traffic) I get 50MPG, on the open road at 55-65 MPH I get right at 59mpg. None of that applies if I roll on the throttle a lot.

John
2014 CB1100 Deluxe #00038
04-20-2018 01:26 PM
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The ferret Offline
Forum Moderator

Ohio
Posts: 31,282
Joined: Apr 2013
Post: #5
RE: How Accurate?
ROFL the point wasn't how many mpg I could get or how far I could go on a tank.. but HOW ACCURATE the fuel computer is on this thing.

.
Defender of the Realm
2014 DLX (the pleasure horse)
2021 NC750X DCT (Angry Bird)
04-20-2018 01:31 PM
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LongRanger Offline
Been There

Evergreen, CO
Posts: 4,220
Joined: Aug 2015
Post: #6
RE: How Accurate?
Ferret, very impressive. I agree the accuracy is quite something.

Ride more. Worry less. Tongue
‘12 BMW R1200R Classic
'15 BMW R1200RT
04-20-2018 01:34 PM
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VLJ Offline
High Mileage

California
Posts: 905
Joined: Sep 2017
Post: #7
RE: How Accurate?
(04-20-2018 12:34 PM)johnf514 Wrote:  I would kill for this kind of mileage.

No need for anything so drastic. Simply twist the loud handle more gently and slow waaaaaay the heck down, to mickey speeds, and you'll be right there.
04-20-2018 07:49 PM
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pdedse Offline
Been There

Oregon
Posts: 3,244
Joined: Dec 2013
Post: #8
RE: How Accurate?
(04-20-2018 11:36 AM)The ferret Wrote:  ...
With calculator 207.3 miles divided by 3.69 gals = 56.1 mpg (computer said 55.8)
Fuel pump said I filled up with 3.69 gallons of gas (computer said I used 3.7)

That's pretty darn accurate if you ask me...

This is so strange...I just got back from a ride and before I started I filled the tank and with calculator figured out I got 40mpg on my previous 96 miles. I thought to myself, "I'll bet The ferret uses the indicated mpg and that's why his is always so high". I was sure that Honda's indicated mpg was "generous" 'cause I had read an article that many car mpg readings were off by more than 10%. I was even going to pm Ferret just to ask about that, and then I see your post.

So question: I know there's lots of factors that can affect mpg. But let's assume that Ferrret and I ride pretty much the same. Let's say we have equally hilly areas. Let's assume also that we go for similar rides where speeds vary mostly from 45-60. Let's assume that we both have correct tire pressure. Is it normal for one CB1100 to get low 40 mpg and another to get low to mid 50mpg? I mean, that's about a 22-24% difference. I have a '17 EX and I had the '14 standard, both low 40mpg.

You guys getting 55mpg or more...please come visit, stay at my home a few days, eat my food, drink my beer, and let's ride and compare notes.

Beer
04-20-2018 08:18 PM
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suhawk305 Offline
High Mileage

Orange County, NY
Posts: 1,098
Joined: Nov 2016
Post: #9
RE: How Accurate?
I started tracking and recording my CB1100 gasoline mileage starting near the end of my 600 mile break-in period. I used trip computer A for tank to tank mileage, and trip computer B for accumulating miles. I also compared the trip computer calculated mileage compared to my calculations. What I found is the trip computer tank to tank mileage can vary due to many reasons. But it is still a decent indicator.
I was more interested over a long term/accumulative mileage using trip computer B. Over 890 miles, my trip computer B displayed 52.2 mpg. Actual computed mileage was slightly better at 53.3 mpg. A small difference (Trip B being lower mpg vs calculated) was consistent throughout.

2014 Honda CB1100 Standard
1967 Honda CB77 Superhawk
You don’t stop riding when you get old, you get old when you stop riding.
04-20-2018 08:51 PM
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Flynrider Offline
Been There

Phoenix, AZ
Posts: 3,233
Joined: Apr 2013
Post: #10
RE: How Accurate?
I have a '13, so I'll take your word on the accuracy Big Grin My fuel computer is in my head, although sometimes the accuracy slips.

Today I was on the CB750, which I haven't ridden out of town in several months. My brain powered fuel computer was stuck on my city riding mileage, which averages about 40 (i have a heavy wrist). Imagine my surprise when I stopped for fuel and only put 2.75 gallons in my 4.8 gallon tank (actual was 51.5 mpg).

I tend to spend too much time worrying about fuel on long trips. Might be nice to have a really accurate gadget like that to take out the guesswork.

Phoenix, AZ
2013 CB1100 - Big Red
1993 CB750 Nighthawk - Tahitian Blue
04-20-2018 09:12 PM
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