After ask so many times here in this thread without any reply finally an article comparing GT games.
Gran Turismo 7 players will be waking up today to some rather unwelcome news. In the brief period during which the latest update was available it was revealed that, for many of the best-earning races in the game, credit payouts have now been slashed -- by more than half in some cases -- dramatically
www.gtplanet.net
Credits per hour (via races)
Gran Turismo 6 – 3.55m credits/hr
Gran Turismo Sport – 2.04m credits/hr
Gran Turismo 7 (v1.06) – 1.75m credits/hr
Gran Turismo 4 – 1.69m credits/hr
Gran Turismo 2 – 1.35m credits/hr
Gran Turismo 5 – 0.87m credits/hr
Gran Turismo 7 (v1.07) – 0.85m credits/hr
Gran Turismo 3 – 0.50m credits/hr
Gran Turismo 1 – 0.50m credits/hr
Time to get the highest priced car (via races)
Gran Turismo 1 – 1 hour (8 races)
Gran Turismo 2 – 1.5 hours (14 races)
Gran Turismo 4 – 2.7 hours (32 races)
Gran Turismo 6 – 5.8 hours (90 races)
Gran Turismo 3 – 7.5 hours (5 races)
Gran Turismo Sport – 9.9 hours (84 races)
Gran Turismo 7 (v1.06) – 10.9 hours (205 races)
Gran Turismo 7 (v1.07) – 17.8 hours (333 races)
Gran Turismo 5 – 23.3 hours (315 races)
PS. Why via races... well it doesn't include bonus login (GT5/GT6) or ticket lottery (GTS/GT7) and others forms of get credit without race.