Negative Fuel Mileage Change (05 Bonnie Black)

Hi and welcome to the forum.
I had a 2004 Bonneville T100, so very similar to yours (790cc with carburettors). Mine had done around 24000 miles and the average mileage before I had to switch to the reserve was about 135 miles. Sometimes this dropped to about 124 depending on riding style but 99 to 100 seems low to me. As your mileage seems to be decreasing, I wonder if you have a blockage of some sort? Check that the vent in the filler cap is clear and it may pay to remove the tank and check out the petcock and any filters, including those in the fuel feed to the carbs.

 

100 - 120 per tank seems about normal
Depends a lot on your style of riding, there again hardly likely to be ringing a Bonneville's neck

 

Riding in town and traffic will create some variability day to day.

 

Agreed, I have an 865 EFI, mileage varies between 90-120 before steady reserve light. Always far better on open road, regardless of wind. She's a thirsty b*tch during the commute.

 

Scary reading....... don't think changing it will increase the fuel consumption though!

 

I have the same filter. They had a batch with this failure. They sent me a mail regarding this, with the range of serial numbers that had this issue, offering a free replacement. Thankfully mine didn't. I'm on my second K&N, and am quite happy about it.

 

Here's the message, and a photo of my S/N, which was specifically confirmed by their customer support not to be affected.

"
Hello,

We've received information that your K&N KN-204 Oil Filter, bought in your Amazon.co.uk order #xxx-xxxxxxx-xxxxxxx, may represent a potential risk of accident.

The affected products have manufacturing date codes imprinted on the ends of the filters that contain as the second and third characters of the code the number/letter combinations of 3H, 4H, 5H, 6H, 7H, 8H or 9H.

If you have any KN-204/204C oil filters manufactured within the specified date range in your possession or inventory, then please contact K&N immediately at:

+44 (0)1925 636950 / [email protected]

You will be advised how to return those oil filters for replacements at no charge.

If you bought this item for someone else, share with them this email so that they are aware of the potential safety issue.

We regret any inconvenience this may cause you but trust you’ll understand that the safety and satisfaction of our customers is our highest priority.

Regards,

Customer Service Department
"