I wouldn't imagine you'd see any noticeable difference for comparable diameter/width in a similar class tire. Any time you go larger it's harder on acceleration and braking, as I and a soon-to-be-compacter car once discovered after going to 31X10.50 BFG AT's on my '88 Trooper.
I'll take a look to see what I can find for you in the XZL's and will post up.
Over 20 years of Isuzu enjoyment...
265 is the width in mm... 70 is the amount of sidewall as a percentage of the width (ie 70% of 265mm)
Informational...
Site that carries XZL's for Land Rover (currently out of stock) with some good info: https://www.expeditionexchange.com/michelin/
SteelSoldiers forum thread with good discussion of comparison between XL and XZL: http://www.steelsoldiers.com/index.p...wtopic&t=14184
Current listings for "michelin" at Gov't Liquidation: http://web.govliquidation.com/auctio...in&cmd=keyword
If you've got time plug in "tires" for the search, GL isn't known for being the easiest site to search but you can find some real gems just poking around there. Then again that's probably why I've got an ordnance loading system for a Harrier sitting next to the shop! Couldn't resist for only $200!
Looks like you might be looking at the 9.00X16 XZL and one place that keeps being referenced for supply is "Bill's Tires" in Pacheco CA (925.689.2678) for around $165 each. Don't know how current that info is, but it's a phone call away.
I say go for it. You can be the guinea pig!
I think those tires look nice. I look forward to seeing them on a VX.
Bart