Sensible tyre question

Ok, so its a Disco 1 with a 1" lift, 8x16 alloys fitted with 205 tyres (on when I got it)
Wanted bigger tyres on, read all the threads about what will and wont fit, didn't ask the question myself as had no desire to be swamped with the tirade of ( good natured?) abuse that seems to follow all such enqiuries.
After reading all arguments about what will or wont fit, made my own decision and got a set of part worn 265/75/16's.
My question isn't about if they will fit or not, it relates more to the difference it will make to the disco.
The gearing will change, obviously, and some folk say the the fuel economy will improve a little ( rolling raduis etc) but theres a lot more tread on the road so I would have thought that any difference there would be cancelled out by the extra energy needed to get the tyres moving.
Secondly, although not overly concerned about top speed, I have always found the disco a little bit revvy when pulling away, making the gear change from 1st to 2nd a bit too early for my liking ( usually a few yards onto the roundabout or junction) so with the larger tyres I should be able to get a little more speed for the same revs and change a little later.
This is all supposition on my part, and i was wondering if anyone out there who has 256's on a 300tdi could let me know exactly what changes, if any, to expect in these areas once theyre fitted.
Paul

I tend to stick with standard sizes but 265/75R16s are about 10% taller than 205/80R16s so:

1. Fuel consumption will be pretty much unaffected. Car still weighs the same and has only slightly more wind resistance (as it will sit slightly higher). Your engine will have to deliver the same power at the same roadspeed but it will do so with 10% fewer revs. It's moving the car that drinks the majority of the fuel not spinning the engine.
2 Your upshifts will be at a 10% higher roadspeed so, if you used to shift at 10mph, you'll now shift at 11mph.
3 Cruising revs will drop from, say, 2500 to 2250.
4 Torque on the driveline components will increase by 10% although they will be rotating 10% slower.
5 Your speedometer needs to be recalibrated as it's now reading 10% lower than it did when you bought the car.
6 You need to check the recommended pressures for the new tyres for the weight and weight distribution of the vehicle as manufacturer's recommendations will not now apply.
7 You *MUST* tell your insurance company. You've already told them about the lift, right?

I wouldnt worry about 5 or 6.

Your speedo will be more accurate so if it says 30 then you are more than likely doing 30 as you have done away with the general 10% error you get with them. Its a good idea to check it at the main speeds with GPS (so sat nav or phone app) to check (30/50/70 for example)

As for pressures you can never go far wrong with having 32psi in any car tyre

You wont notice any difference when pulling away, 1st gear is a waste of time, you can probably pull away in 2nd most of the time

I yguessed at 32 when I put them on this evening. Just nipped out for some baccy and didn't notice any real discernible difference in pulling away, but did seem to at lower revs at a speedo reading of thirty than usual. The ride is a little more forgiving over potholes ( bigger sidewall to absorb the shock I suppose) and the steering is marginally heavier but it feels better in a straight line. Only other thing is a slight rub on the radius arms at full lock so a quick adjustment tomorrow should resolve that.
With regards the insurance, I insure on-line and its almost impossible to contact them by phone and any alterations to a policy on the website (we recently tried to make a change on my wifes policy) are a nightmare so I reckon it easier to wait a few months till it expires and re-insure with vehicle changes then.

Easier yes, better no. If you have an accident between now and your renewal your insurance will be classed null and void