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[CouldBFaster]

Hey Guys I am having an issue with my gas mileage. Well before I hear it from everyone. I did my test on my mileage on the hwy at just a little over the speed limit around 75-80mph. No hard fast starts no hard WOT getting to speed. Just normal "normal person" riding. I am getting an average of 25mpg. Now I just don't understand why. That's what I was getting riding how I like to. Any Ideas?

Thanks

[RedDragon]

Hey Guys I am having an issue with my gas mileage. Well before I hear it from everyone. I did my test on my mileage on the hwy at just a little over the speed limit around 75-80mph. No hard fast starts no hard WOT getting to speed. Just normal "normal person" riding. I am getting an average of 25mpg. Now I just don't understand why. That's what I was getting riding how I like to. Any Ideas?

Thanks

Do a compression test. 

[bluestreak]

Hey Guys I am having an issue with my gas mileage. Well before I hear it from everyone. I did my test on my mileage on the hwy at just a little over the speed limit around 75-80mph. No hard fast starts no hard WOT getting to speed. Just normal "normal person" riding. I am getting an average of 25mpg. Now I just don't understand why. That's what I was getting riding how I like to. Any Ideas?

Thanks

How about giving us the basics first.  We can't offer any meaningful suggestions unless we have that. 

What are you riding?
How many miles on it?
What engine and air mods have you done?
When did the fuel mileage start getting bad?  All of a sudden or over some time?
How's the bike running form a performance stand point? 
What spark plugs are you using and when was the last time they were changed?

[CouldBFaster]

Hey Guys I am having an issue with my gas mileage. Well before I hear it from everyone. I did my test on my mileage on the hwy at just a little over the speed limit around 75-80mph. No hard fast starts no hard WOT getting to speed. Just normal "normal person" riding. I am getting an average of 25mpg. Now I just don't understand why. That's what I was getting riding how I like to. Any Ideas?

Thanks

Do a compression test. 

Compression test? really would I feel a power loss if I had low compression?

It runs great. No lag, fast off the line and wile rolling on the throttle.

I have a power commander
K&N big air cleaner.
Cobra speedster short pipes.
been a little wile on plugs but no power loss.
I have never been nice to this bike so i couldn't tell you when the mileage dropped.

[RedDragon]

Hey Guys I am having an issue with my gas mileage. Well before I hear it from everyone. I did my test on my mileage on the hwy at just a little over the speed limit around 75-80mph. No hard fast starts no hard WOT getting to speed. Just normal "normal person" riding. I am getting an average of 25mpg. Now I just don't understand why. That's what I was getting riding how I like to. Any Ideas?

Thanks

Do a compression test. 

Compression test? really would I feel a power loss if I had low compression?

It runs great. No lag, fast off the line and wile rolling on the throttle.

You would be surprised how well this bike will run with low compression. Gabe ran his bike up to Johnny Cheese's with compression low on one cylinder and it ran great, only the fuel light came on around 85. Just throwing it out there because I know that it could cause the mpg problem and it is very easy to test and eliminate this as a reason if you have the gauge.

[RedDragon]

Hey Guys I am having an issue with my gas mileage. Well before I hear it from everyone. I did my test on my mileage on the hwy at just a little over the speed limit around 75-80mph. No hard fast starts no hard WOT getting to speed. Just normal "normal person" riding. I am getting an average of 25mpg. Now I just don't understand why. That's what I was getting riding how I like to. Any Ideas?

Thanks

Do a compression test. 

I have never been nice to this bike so i couldn't tell you when the mileage dropped.

So if you have never been nice to this bike, did it ever do any better than 25 mpg? 

Has it been mapped by anyone?

[j1mmyj4m]

Bypass the PCIII.

[bluestreak]

Hey Guys I am having an issue with my gas mileage. Well before I hear it from everyone. I did my test on my mileage on the hwy at just a little over the speed limit around 75-80mph. No hard fast starts no hard WOT getting to speed. Just normal "normal person" riding. I am getting an average of 25mpg. Now I just don't understand why. That's what I was getting riding how I like to. Any Ideas?

Thanks

Do a compression test.  

Compression test? really would I feel a power loss if I had low compression?

It runs great. No lag, fast off the line and wile rolling on the throttle.

I have a power commander
K&N big air cleaner.
Cobra speedster short pipes.
been a little wile on plugs but no power loss.
I have never been nice to this bike so i couldn't tell you when the mileage dropped.

The VTX runs a mild state of tune with relatively low compression numbers. Yes you'd notice a lack of performance if compression started to fall off enough and you'd notice lower MPG figures but it would be running very poorly and it would be obvious something was bad wrong.  I don't think compression is your problem because you say it runs ok.

We can't use Gabes bike as an example in comparison to what your experiencing.  Gabe was running high compression 10:1 pistons. Only the front cylinder was low and even with that, that "bad" cylinder was higher compression than a stock 1800 has and the rear cylinder was even higher still. That's why it ran "fine" like a normal VTX going to Johnny Cheese's. Even though it was not producing the compression numbers it should have for 10:1 pistons and therefore was not the real power house it should have been, the compression it was generating was more than enough to support good combustion.............. so it ran "fine" and ran no different than a normal stock VTX. The fact he's running high lift cams and his PC was questionable doesn’t help fuel mileage either.

Based on your response and not showing something obvious, I'd say ditch the PC altogether or just reload another similar map and ride a tankfull through it while taking very accurate fuel and mileage numbers.  Use a GPS if you can.  VTX speedos are notorious for being off.  Before pulling the PC, I'd copy the map and review it for any glaring error percentage numbers.  Bad PCs have been known to produce low mpg firgures when they screw up sometimes.

I'd pull at least one plug and check to see how foulded it is.  Pull one from a deep socket location because it will show any signs of fouling first.

What grade of fuel are you running?  Regular or premium?

[hipshot]

On my 1800 the mileage nosedives when I get over 70. 65 - 70 seems to be the sweet spot for mileage.

[Txcajun]

Trent has never ridden 65-70 in his life.

[bluestreak]

On my 1800 the mileage nosedives when I get over 70. 65 - 70 seems to be the sweet spot for mileage.

I agree. The VTX is under geared by a good bit if you ask me.  That's why I'm going with a 1300 differential. 
Currently running the stock gearing, normal on the hiway I'm getting 38-42 mpg.  Riding it hard above 70 mph it drops to 30 mpg.

[DEMON]

yes do a compression check...     

also check your wheels by doing a spin test... if you a caliper stiking or a wheel bearing going out it will affect your mpg

[alejandro1800vtx]

my X was doing 25-27 milles x gallon on with rinehart pipes and power commander tuned for power, check maps, bet your Cranberries your are tunned on the power side, i will look i know i have at least 14 maps from a dyno session in my old laptop get back to you soon  

found the maps, sending you a rar file with all the ones i have just upload one at the time and check witch one fits you.

[johnnycheese]

fuel pressure regulator okay?
load control on a dyno if it is okay to see if it is tuned corrctly

[VTreX]

.   Put fuel in when the light comes on!!!!    Move to the mountains it will do better !!!   Ride safe ride long.