I have had three Tri Glides to date and I am currently driving a 2016 Tri Glide, during all that time when I filled the bike up the estimated mileage has always been in the neighbourhood of 320 kms (200 miles) per tank. I was on a ride this weekend and the estimated mileage dropped to 244 kms (151 miles). At first I thought the estimation was wrong but after three (3) tanks of fuel it was clear that my mileage per tank had gone for a dump. Can anyone suggest to me why this would have happened or more importantly what the cause could be.

 

If you figure it out please post the cause and fix.

My 2014 Triglide got 27 MPG new and after 10,000 miles it still gets 27 MPG!!

I have tried cams, V&H header pipes plus Trike mufflers, Thunder torques, adjusting the timing and now playing with the fuel/air mixture with a Power Vision. So far nothing has changed it.

 

I do not have a tri-glide...so take this for what it is worth.

I had a drop in MPG and could not figure out why...turns out my rear wheel bearings went out. I changed them and my MPG went back up to what I was used too.

Morale of the story...MPG can have a lot of different cause/effect scenarios. I keep track of my MPG and if I see a change that I can't explain I look to the bike and try to determine anything that has changed.

 

I have a 2012 that sees the same kind of distance on a tank. I gave up trying to figure it out. Will be interesting to see what you find out.

 

I took it to the dealer and spoke with the only mechanic that works on my bike, he said that the bike might need an emissions upgrade (what ever that is) and then re mapped. Its under warranty so I will let them try. The appointment is not until August 9 so I will update this post then to let you know.

 

My 13 gets 30-32 depends on speed . If I get on the interstate it's 30. I was on the Blue Ridge parkway for a couple of days I got 45 mpg but never really went over 50 mpg

 

Wind and speed is detrimental to gas mileage ! Ebert

 

2014 FLSTC - recently had a check engine light, code P0118 - the engine temperature sensor failed open. Straightforward replacement. Why is this relevant? For the last few months, I noticed my mileage decrease and I was getting some backfires on decel. Thought I'd have to hook up my PV2 again and re-tune.

When the temp sensor goes bad, the ECM thinks the engine is cooler then it is, adding more fuel than appropriate.

Not sure if this is true in your case. You could measure the resistance of the engine temp sensor to check...

 

When I'm loaded and pushing it into the wind to get to my destination, the mileage really drops. On fill up the range can be as low as 145 miles. Once I cool it and enjoy the scenery, the range will slowly climb over the next couple fills.

 

Speed and wind play a huge part in how much mileage I get on my 2100.
If I keep it below 70 with normal headwind, I get about 33.
If I run past about 75, the milage drops drastically.
I will also add that I'm quite a load myself, being over 300 pounds, so that is a factor in mileage also.