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holly
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« on: August 28, 2024, 06:24:21 AM » |
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Every time I fill up, it appears my mpg is dropping. The bike has always gotten 38 to 40, yesterday at fill up a little over 33. The 2 or 3 times before 36. No out the ordinary conditions, I always ride mostly highway at 60 mph. Bike has 49000 miles on it and run great, just don't understand the somewhat sudden drop in milage. I did notice smelling gas when I fired it up yesterday, but not leaking fuel anywhere. Just figured the tank was venting from sitting in the hot garage for many days. Any ideas?
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WintrSol
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« Reply #1 on: August 28, 2024, 07:46:33 AM » |
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How many miles are on the air filter?
Also, use a bright light to look at the bottom of the tank, around the petcock, for any fuel wetting. I had to replace the O-ring on mine recently (similar miles on clock). It doesn't take a lot of leakage to start smelling, and also drop mileage.
Assuming you are using the stock petcock, pull the vacuum line at the carb end and check for any fuel wetting the inside.
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98 Honda Valkyrie GL1500CT Tourer
Photo of my FIL Jack, in honor of his WWII service
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bassman
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« Reply #2 on: August 28, 2024, 08:14:38 AM » |
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Tire pressure up to snuff?
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holly
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« Reply #3 on: August 28, 2024, 01:03:46 PM » |
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Air filter is good, air pressures good, Pingle petcock in use for many years. Took a flashlight and and did not find anything. However I also did not smell any fumes this time. The station where I usually buy gas used to be Valero and is now Casey's. I filled up at an Exxon yesterday, will see if anything changes. Thanks to everyone for input.
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98valk
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« Reply #4 on: August 29, 2024, 05:03:16 AM » |
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premium or regular octane gasoline? how long hot garage?, fuel evaporates a lot sometimes.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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holly
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« Reply #5 on: September 05, 2024, 05:48:25 AM » |
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I have always ran 87 octane, but the evaporation thing could be the problem. I did not ride much at all in August due to the Texas heat, just didn't know how much fuel would actually evaporate in that period of time. That is really about the only thing I can figure out that is causing the mpg change. Cooler weather now, I will be riding more and garage will not be as hot. I will check this next tank and see if things improve. Thanks for the help.
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old2soon
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« Reply #6 on: September 05, 2024, 10:42:27 AM » |
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Well since No one else here mentioned it your Right Hand has a LOT to do with MPG! Also how far you wind UP the tach. And while I had my 99 I/S I Never really was That concerned bout MPG. Way Too much FUN when twisting The Dragons Tail!  RIDE SAFE. |
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Today is the tommorow you worried about yesterday. If at first you don't succeed screw it-save it for nite check. 1964 1968 U S Navy. Two cruises off Nam.
VRCCDS0240 2012 GL1800 Gold Wing Motor Trike conversion
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Bagger John - #3785
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« Reply #7 on: September 05, 2024, 05:20:18 PM » |
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Well since No one else here mentioned it your Right Hand has a LOT to do with MPG! Also how far you wind UP the tach. And while I had my 99 I/S I Never really was That concerned bout MPG. Way Too much FUN when twisting The Dragons Tail! RIDE SAFE. My I/S ('01 49 state model) gets around 28-30MPG. It was SuperValked and has a cut-down windshield. My '99 Tourer (CA model) routinely gets over 40. It has an I/S tank, trunk, radiator and pods, Batwing fairing...I/S ICM, fender and so forth. The only real differences between these bikes is in the fairings themselves and the CA models cams plus smog plumbing. They're jetted identically and the carbs are set up the same. Both are ridden equally hard. Meaning, fast but not abused. Go figure. |
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da prez
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« Reply #8 on: September 05, 2024, 06:25:23 PM » |
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De smog and/or chec
De smog and or check for vacuum leaks and intake runner o-rings. Also , runner clamps could loosen.
Go back to basics and do not assume all is well.
da prez
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holly
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« Reply #9 on: September 17, 2024, 06:31:51 AM » |
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I'm back up to a little over 38mpg on last tank, beginning to think poor performing gas or combination of evaporation and poor performing gas.
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98valk
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« Reply #10 on: September 18, 2024, 07:00:13 AM » |
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I'm back up to a little over 38mpg on last tank, beginning to think poor performing gas or combination of evaporation and poor performing gas.
some great basic info such as tire wear, road surface, ambient temps, etc., about mpg that affects all vehicles not just OTR big rigs https://www.cummins.com/sites/default/files/cummins_secrets_of_better_fuel_economy.pdf |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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rug_burn
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« Reply #11 on: September 19, 2024, 10:16:37 AM » |
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My mileage varies between-
28 mpg driving maybe a little too lustily on the curving canyon roads around here
to about 39 mpg, obtainable mainly when my tires are worn out and I'm tryin' to get another thousand before I replace them...
If I keep it down to about 65 I can get 35 mpg, consistyently.
So I agree with 'old2soon'- the way you twist the throttle makes a big difference.
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...insert hip saying here..
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