Triumphrat

trav13

i have seen numerous posts on here about gas mileage and everyone seems to be getting way better than me. Im lucky to get 110 miles before hitting reserve. 42/125 jets, D & D's. stock airbox. I dont ride really agressively, but am not over easy on the throttle either. is this normal in your opinions or could there be another factor in my poor gas range? I have also been considering a 18/19 tooth sprocket to help this problem. With gas prices the way they are i did the math and its actually cheaper to drive my car than my bike. :???:

dazco

If i had to take a wild guess it would be that with D&D's and richer jetting, not improving the air intake might be leaving you rich and therefore using more fuel and NOT gaining the power you would if the airbox was opened up some. If you did that and gained more power you'd basically be getting more accelleration per amount of gas used and therefore need to twist the throttle less to get the same performace you do now for the same riding style you do. Thats just a guess, but seems like a possibility.

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2005 Speedmaster, Neon Blue, Thunderbike pipes, snorkel removed, UNI filter, drilled airbox, 130 mains, TBS needles.(2 shims) And speaking of Speedmasters, HERE'S MINE

Diego

> i have seen numerous posts on here about gas mileage and everyone seems to be getting way better than me. Im lucky to get 110 miles before hitting reserve.

So *** is your <u>actual</u> gas mileage????

And I don't mean some flaky guess about what you have left in the tank at reserve, either. How many miles from one fill-up to the next, and how many actual gallons did it take to refill?

You get 110 miles before reserve when most of us get 125, or for some a little more. That's not a huge difference...just a little over 10% less than what I get, when my actual measured MPG is in the high 40s to about 50.

I don't know what sort of "math" you're doing, but unless your car is getting in the low- to mid-40s MPG, or unloess you're giving the bike high octane for no good reason, the bike is not costing you more for fuel.

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John

trav13

ok Diego, *** do seem to have such an attitude for, no need to for man. my last two fill ups are 123 miles with 3.2 gallons, 38 mpg, and 120 miles with 3.25 at 37 mpg. thats my math. and i get 320 miles on 10 gallons in my honda. thats 32 miles per gallon on regular 87 gas which there fore is roughly the same money spend

ssjones

I agree, need some more specific data. FWIW, my America (Specialty Spares/Uni/No snorkels/ 44/132.5 jetting) gets between 41-43 mpg. Don't think I ever went past 44 mpg. I sync'd the carbs a few weeks ago. They were WAY off but syncing didn't seem to have any effect on my MPG.
Unless you are in the mid 30's, I'd say that is just the normal range.

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Al
66 Bonneville Chopper - The Beast
02 Bonneville America - Beauty

wonderdog

Triumph owner's manual calls for 89 octane, not 87. Also, with the "new" blends coming out (ethanol), gas mileage is supposed to drop some.

Dennis

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Waste is a terrible thing to mind.

Diego

> *** do seem to have such an attitude for

Because the last time we had a question like this, the thread rambled on for nearly four pointless pages because the guy had not done and would not do the real math, but insisted on making assumptions about what he had left when he switched to reserve. This can vary enough from bike to bike to make comparisons and assumptions utterly meaningless.

I gladly give you credit for having done yours, and I appreciate seeing the numbers. My apologies for jumping to conclusions about how this was likely to proceed.

It does seem 37 and 38 miles per (US) gallon is a bit low. And using 89 octane in the bike versus 87 in the car would indeed make up the dollar difference. I'm inclined to agree with Daz that you may be running richer than you need to with those jets; don't know what sort of shims or additional adjustment you're running with them, but a bit of tweaking might give you better mileage while keeping your performance.

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John

panda

an incomplete list to check
is either brake binding? are you resting your foot on rear brake pedal.
spark plugs ok with correct gap.
check emissions to ensure not running rich.
check air filter is not clogged
choke works, (especially disengages properly) and you ride from starting without idling with choke in. ie ride as soon as it starts.
switch of petcocks before stopping engine at end of ride.
Some engine management systems 'learn' so if you have put in dose of poor grade fuel, it will continue to run retarded when the new good stuff goes in. ( do not know how triumph system reacts, may not apply )
It has been my experience that poor economy is usually due to the engine management system.. Not the electronic one under the tank , but the bio one at the end of your right arm. ride smoothly, do not jerk on the chain. Mount a plastic cup of liquid on your bike and try to keep as much as possible in the cup as you ride....( for practice only) will detect and display sudden changes that are fuel consuming.

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A wise man learns from his mistakes..
A genius learns from other peoples mistakes.

Normandy

I notice my gas milage drop when hauling passengers.

wonderdog

UHOH, I think I've been resting my foot on the brake pedal. I was very conscious of it when I first got my Bonnie, but have relaxed a good bit since. Thanks for the list. Also, thinking about it, my bio engine management system definitely needs adjustment. The message center has been pulsing my right arm for greater acceleration much more frequently. :-D

I think any gas mileage figure for me is useless until out on the highway with some consistent speed over time. In town is so erratic, stop, go, passengers, no passengers. Can't wait to get away!

Dennis

[ This message was edited by: wonderdog on 2006-04-29 16:53 ]

__________________
Waste is a terrible thing to mind.