4.5 petty 105 landcruiser owners. Regarding 33's

I guessing you also changed to a mud terrain for that result?? if that's the case for my 4.5 I will stick with 265 75 16's

yeah that seems correct although I thought if there was not much difference in performance and fuel I could use them, looks like 265's will do the job at least for a couple years.
cheers

I also have a 1HZ in a 105 series cruiser, I'm still using 235/85, still have the factory snorkel, but have an aftermarket turbo and 3 inch exhaust.
I normally drive conservatively, I consistently get high 12's-13/100ks, It didnt change much after the turbo went on IF driven sensibly, start stomping on it and you will PAY (but now it goes good) I live 29k's from work which is mostly 80kph zone, a few roundabouts 2 t-intersections and about a dozen sets of traffic lights , 1 am starts means no traffic, coming home can be a bit stop start, my last main/sub tanks took 122 liters for 1015 kilometers.
Mine doesn't like freeway speeds nor towing the camper(1.4ton) with the combination of both, it willl go out to 18-19/100k
Just adding bigger tyres will generally drop 1-2 liters/100, add weight such as bullbars, winch, draw systems, roofrack and that will all add up pretty quick knocking fuel economy, just like making little adjustsments can make the fuel economy improve,

I also have a rooftop tent
When i canged the rear exhaust because it was crushed i had a noticeable improvement in power this is a regular hill i go over with matching conditions
I do not use 5th gear at all sue to horrible noise but cruise very happily at 90 about 2500 revs
The speedo reads 3-4k under the gps
You only get accurate fuel economy if you calculate ever fill and the new gps's you can fill it in as you fill up
I am looking forward to putting Turbo in in june next year
But very pleased with the larger tyres and mostly just the $350 i spent on the exhaust
Colin

Gday Matt
I have a 105 with 285.75. r16 and my average fuel use around Melbourne is for the last three fills is 12.9 / 13.25 / 13.9 ltrs /100. It just depends how far you push the pedal down.. Power , not a lot but good enough for me. Up in the high country the 105 goes where all the others go and at the same speed .