The year/model statistics found in this website's "encyclopedia" section are mighty interesting. What I've found most curious is according to the stats, a 1915 touring car weighs 310 pounds more than the 1914 touring. What would account for that considerable weight gain ? Any ideas ?
FWIW, we know the "high head" cars were de-tuned, less compression, and the addition of the self-starter added 90 pounds. Demountable rims added another 40. Convenience cost in terms of performance.
310 pounds is not a realistic number for the difference between a 1914 and a 1915 touring. I would believe 31 pounds for the beefier cowl section and hood former. I have one of each, I doubt there is much difference.
For sure the 1909 - 1912 cars prior to the slab side bodies introduced in mid 1912 are noticeably lighter and - if the engine is original - more powerful too.
For comparison, I recently weighed my 1913 Touring on a "drive-on" type scale. It weighed 1,250 pounds. There were a few extra parts under the rear seat and a small jack that would have slightly affected the outcome.