The display isn't accurate... Also removing the spare for weight reduction is pointless.2008 SC
I removed my spare (heavy!) added two cans sealant and inflate.
have very little excess stuff
jacked the tires and was getting 13.5 l/100km on premium fuel
But the display would make crazy jumps up or down every few days. In general it's around there. Not very much city driving and I do "draft" behind other cars for a both economy and radar/laser protection but I don't go much over speed limit in any case. Just too much of a brick makes no sense.
Pointless because 1.) the tpms wants the spare there 2.) if you get an irreparable flat you're stuck 3.) dropping 1% of an enormous SUV's weight isn't noticeable. I mean it's your car, do whatever you want but it's silly to lose the spare because you think you're gaining performance in a 6000 pound SUV. A full size spare IMO is a very nice thing to have. I'm content to keep mine and lose a fraction of a % in performance/fuel economy.Yes pointless for someone who can't feel or realize the difference.