Triumph Bonneville (2004,790cc Carb) - Fuel Range

[kentfallen]

Just a quick question -

I'm off to Scotland for a 6 day (rushed) tour of Scotland next week. I have decided to take my 2004 Triumph Bonneville which is the Hinkley made carbed model (with a nice metal tank badge not a cheap nasty plastic one).

The bike has done 5,800 miles.

The tank is apparently 16 litres in size which roughly equates to 3.5 Gallons.

The bike supposedly does between 50 - 60 Miles per gallon which gives a maximum useable range of:

50 MPG = 175 Miles
55 MPG = 192 Miles
60 MPG = 210 Miles

My standard fill point is normally 125 miles. For the purpose of this trip I have it in my mind that I can probably safely push this to 150 miles on the odd occasion....

I have changed the gearbox sprocket from the OEM 17 tooth version to a 19 tooth version (early carbed Bonnies had a 17 tooth fitted as standard whereas later models got a 18 tooth as standard). My reasoning being it will allow the engine to be calmer on the motorways where I will aim to cruise at 70 MPH (any faster and it soon gets too windy and tiresome). My 1st gear still seems to have plenty of useable power from a standing start. The revised gearing instantly produces the illusive 6th gear I was always looking for. Gone are the days of trying to knock the gearchange pedal up from 5th gear to a non existant 6th gear!

Not sure the size of the rear sprocket but I presume it's a standard OEM fit (42/45 tooth)? Andy (Threewheelbonnie) please advise. I have used Andy's excellent blog to work out the likely result of changing my gearbox sprocket.

Now my questions -

1. On average at what point does the reserve kick in?
2. On average how many miles will the reserve last?
3. What fuel consumption will I likely get from my set up cruising in top at 70 MPH?

I greatly value all opinions.....

Oh yes, THANKS for taking the time to reply.

Neil