I have a chance at losing at Madrid so I don't know bout that one
A spec seasonal at Madrid pays about the same and takes under 7 mins, more fun than b spec too.
Tokyo pays less but is quicker so probably nets around the same. IMO its more fun and a much easier win if you're just grinding.
NUR
On new Bspec just go in with F1 BMW lower the suspension in 15min 840000. With bonus
Yeah my skill level isn't all that great I jus love the game and want all the cool cars and i got most of um jus need money incase sum cool pops up
A spec seasonal at Madrid seems to be the best payout per minute and is a really fun race when you start reducing the ability of the cars you use, I won it last night (I dont use a steering wheel) in a mazda Furai which is very light but low on power. OOOdles of fun.