Ok, so I have a 2012 Dyna Street Bob, only owner. It has a High Flow Air Filter kit, and V&H big radius mufflers, Screaming Eagle Plugs and Wires plus Stage 1 dealer made map. Ever since I got on the bike it Gas Mileage was dead on 43 MPG at 4.7 Gal tank. After a trip to Austin all of the sudden it wont do more 112 miles on a tank. It has no leaks, it still performing as expected, so no apparent loss of power or anything, no check engine light or anything. Any ideas?

 

Corrupted map. Check your plugs?

 

Plugs are brand new, did not know the map could get corrupted. Oh well, to the StealerShip it is.....that what I wanted to avoid though.

Thanks for the reply.

 

Bad gas? How many tanks have you put through it since this started?

 

6 tanks so far, different gas stations, all tanks give me the same MPG 110-115 miles per tank. I changed the plugs and plug wires at her recent 25K miles tune up, thinking that could be the issue. There is no loss of power, or studder she runs as smooth as always, peels of the light like always.

 

Probably unlikely, but a bad fuel gauge could make you think you're empty when you're not.

 

Since you first stated you're getting 43 mpg but then tell us how many miles you're getting on a tank, it begs the question: Are you relying on a miles-to-empty display or are you actually checking your mileage with the odometer?

 

how are you checking your mileage, are you using the start with full tank, next fill up use the miles ridden divided by gallons pumped in at refill?

 

Heavy on the throttle maybe????

 

this doesn't add up. He states he gets 43mpg at 4.7gal. says he got 112miles last tank.

He then states "all tanks give me the same MPG 110-115 miles per tank".

First, 43 mpg at 4.7 gal should get you 200+ miles for a tank, but he stated he has been getting 110-115, so my question is how 112 bad if that is what you normally get.

Also, isn't 4.7 the total fuel capacity in a fuel tank, seriously doubt he is draining the tank exactly the same amount every time.

Things don't add up. I suspect the OP does not understand how to truly calculate fuel usage. Just my .02