| Yes. Disagree. In 12-93 my Accord came with 185/70/R14 Goodyear eagle ( had just 165mm width, I reported Goodyear M'sia to ministry of trade ) &
5" wide steel wheels. In 1-94 I fitted 195/70/R14 Dunlop JCinq on these
5" wheels, rolling resistance (rr) did not rise noticeably, same again in 4-
98 on 6" wide alloy wheels ( each with these JCinq weighs 16kg ). Now with 195 & 205/65/R15 Michelin mxv3a on 6½" wheels ( each with tyre weighs 18-19kg ), rr is significantly lower than from Goodyear / Dunlop, same result in 6-02 with a heavier Michelin model of 205/65/R
15 ( with wheel weighed 20kg ) Every tyre used had / has the same pressure ( 2.3 kg/cm² when cool ). This Accord has been parked on level ground under my porch, pushed to & fro to e.g. chk rr
/ brake bind or to get a rinse fr rain, daily since 1-94, no brake part changed. Tyre brand / model
/ pressure / toe-in makes a far bigger difference in rr, than width
/ weight can ( certainly cannot cut mpg by 12%, from just a change fr 185 to 205mm width / weight ).
| That's why economy cars have the thinnest, highest profile tyres i] thinnest tyres are the cheapest ii] cheap cars have narrow e.g. 4½" width wheels which cannot hold broad tyres well : tyres' side walls will not flex = hard ride, outer sides of thread will not touch tarmac =