Go Back   EcoModder Forum > EcoModding > Motorcycles / Scooters
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 03-19-2011, 07:18 PM   #1 (permalink)
Master EcoModder
JRMichler's Avatar
Join Date: Feb 2011
Location: Phillips, WI
Posts: 976

Nameless - '06 GMC Canyon
90 day: 33.74 mpg (US)
Thanks: 187
Thanked 404 Times in 259 Posts
It was NOT the synthetic oil

Once upon a time, I had a Honda CB350. That bike averaged 60 MPG in a mixture of city and highway driving. I didn't specifically try for mileage, but did not drive it hard either.

I wanted to find if Mobil 1 synthetic would get better gas mileage. So I started with a pair of baseline MPG tests:

30 MPH 87 MPG
60 MPH 60 MPG

Changed to Mobil 1 and reran the MPG tests:

30 MPH 103 MPG
60 MPH 63 MPG

These results did not make sense until I realized that I was getting better at holding a constant throttle position. This was especially tricky at 30 MPH, because the throttle was barely off idle.

This could be called an A-BC test. It shows the need for careful testing of changes (see the How To Properly Test sticky in Ecomodding Central).


1) The Honda CB350 responds very well to a steady hand on the throttle.

2) I still have no idea if the Mobil 1 oil caused better gas mileage in that bike.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 03-19-2011, 08:23 PM   #2 (permalink)
Master EcoModder
Ryland's Avatar
Join Date: Jan 2008
Location: Western Wisconsin
Posts: 3,904

honda cb125 - '74 Honda CB 125 S1
90 day: 79.71 mpg (US)

green wedge - '81 Commuter Vehicles Inc. Commuti-Car

Blue VX - '93 Honda Civic VX
Thanks: 867
Thanked 433 Times in 353 Posts
I too had a CB350 for a while but never saw 60mpg, I tended to average 45-50mpg, the thing with synthetic oil is that alot of it will ruin the wet clutch of a motorcycle if it has friction modifiers in it, so just a word of warning, I've replaced two wet clutches for this reason.
But you are right, the CB350 has constant velocity carburetors, so a slight twitch of the throttle would make it open up the diaphragm and thus open up the needle for the main jet in the carburetor, dumping in extra fuel.

  Reply With Quote
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com