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^^^
This extra mass is also offset by stiffness reducing rolling resistance.
Suspension can be tuned for the new ride quality to acheve no change.
Also on the delete list were the jack, lug wrench, associated mounting hardwere/brackets, cubby , concealment/ false floor(hidden compartment common in station wagons, sedans, and coupes) .
The manufacturers figure there's a high enough percentage of people that have no clue how to change a spare tire so there's really no point in having a spare (say thank you to budget cuts removing most shop related classes from schools). Most of today's younger drivers (<40) will drive it till the tire comes apart and then they'll call a tow truck. Because of this lack of knowledge tire pressure monitoring systems became a safety feature.
I'm sure there is some white papers describing the change of run-flat tires Vs spare tires and non run-flat tires
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20
Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg
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