Bonneville America Forums Forums Technical Forums General Tech gas mileage

so my speedy gets 38mpg and it doesn't appear to matter how i ride. i did my comute, a really slow ride through wine country and blasts down the highway. the bike runs great with no popping and no stinky exhust. ai removed tors not sure about the jets.
should i expect better mpg my other 3 bonnies got about 45mpg.

I get 48-52 mpg w/ a 18 tooth front sprocket, AI and throttle sensor removed, Chevy 605 pipes, and a unifilter, usually about 60-80 mph







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42ish city and 52ish hwy....Has not changed from the time I got it (TORO's, stock intake) to now (EPCO's, UNI, cut crossover pipe, desnorkle and cut bottom of airbox)

I get 50+ mpg on average. No city riding for me. Almost stock setup. 60-80 mph. Yours does sound kinda low.

06 tba ai removed,bubs pipes,kn filter with snorkel removed, approprialty rejetted,I ride it like I stole it ,all the time.45 mpg.

i think i'll drop it by the shop to put on the sniffer to see if there is something wrong with the mixture. tonight i'll check all the rubber thingies maybe i have a intake leak.

thanks for the replies that 43-55 is what i was expecting.

I'm happy when I get 40mpg

Its all that chrome ya got.That stuffs heavy dude

38 mpg for me City/Highway mix.

33mpg at 100mph.
Gotta love it.

I bet those new front hub bearings will improve the mileage a bit Brian.

All that motor huh I was just pondering that same thought as I was filling up my tiger tonight.it has twice the horsies {literally} as my tba and get 45 mpg the same as my tba.technology is awesome eh?

doesn't it also have an extra piston?

Have a look at the spark plugs. They'll tell you if you're running rich or not pretty quick.

How's the exhaust? Is it black/sooty? Is it wet?

H.

Yup,,,another piston to drink fuel and still gets as good mileage as my tba.apples and oranges I know,just sayin is all.

05 Speedmaster 865 engine:

Factory issue stock with international tune for emissions - 50 MPG with engine running so lean & hot that the outer pipes turned blue.

Engine now tuned for what is considered reasonable and customary optimum fuel to air ratio with a flat torque curve as dyno proved - 40 MPG average - high speed highway 30 to 35.

thanks...i'll have time this weekend to play with the bike. i'll check the plugs and maybe play with the mixture.

Fuel mileage stats FYI from some recent logs per fuel stop
Motorsickle: perfire, 130/45, TBS needles w/1 shim, 2-1/2 turns on the screws, D&D's, K&N with polaris bellmouth. Current odometer 64957.


Speed limit riding
16-Sep-10 Coudersport, PA on rural roads to Wellsville, NY 45.4 mpg
18-Sep-10 Wellsville, NY on rural roads in the rain to Dansville, NY 43.0
19-Sep-10 Rally ride in the Dansville, NY area 48.9
19-Sep-10 Dansville, NY on rural roads to Salladasburg, PA 46.8
19-Sep-10 Salladasburg, PA on rural roads to Mcveytown, PA 47.5
19-Sep-10 Mcveytown, PA both rural and interstate to Frederic, MD 49.5
20-Sep-10 Frederic, MD on slabs and US15 to Culpepper, VA via Silver Spring MD 45.7
20-Sep-10 Silver Spring MD on US15 /29 to Waynesboro, VA 54.1
20-Sep-10 Waynesboro, VA on the BRP to Vinton, VA 46.6
20-Sep-10 Vinton, VA on the BRP to Fancy Gap, VA 47.9
20-Sep-10 Fancy Gap, VA on the interstate to Rock Hill, SC 45.6

This is the difference between 70 mph and 80 mph on the slabs
21-Sep-10 Rock Hill, SC on the interstate to Columbia, SC 40.6
21-Sep-10 Columbia, SC to on interstate to Port Wentworth, GA 40.4
21-Sep-10 Port Wentworth, GA on interstate to Woodbine, GA 39.3
21-Sep-10 Woodbine, GA on interstate to Ormond Beach, FL 41.6

thanks...maybe the problem is my right hand..

44 highway is typical for me. ethanol seems to affect my mileage - where are you riding?

I got 62 mpg when I was running in my EFI America.
'Course our gallons are bigger than yours!