Yes, this game in arcade use all in all for sprites 1mb of gfx. with the 8x8 tiles, let's count 2mb of GFX.
For arcade graphics accuracy, 4mb
Hi Silver, if you don't mind me asking, how were you able to rip the sprites from the Arcade board?
I don't have much experience with the not playing the games side of MAME, (even though I have been using it since 0.29, when the full romset was just over 900mb).
I managed to get the backgrounds, and all the graphics used on the overlay, but no actual in game sprites. I know that Enduro Racer was either encrypted or compressed originally, because for a long while the only playable Sega roms were bootlegs that had been found in Europe for that game and a few others. I tried both, and all I got was the overlay graphics and the backgrounds.
I obviously don't know what I'm doing
Also, sorry to say, the sprite sheets you have uploaded are not usable after being hosted here. I was going to have a go myself but they have been messed with once you uploaded them unfortunately...
This was what I got when I grabbed the originals:
For some reason even though the filetype is still .png, it appears the upload process still resampled them. If there is any chance I could get the full set after you finish, I would love the opportunity to help out. My personal plan was to rip the arcade graphics, (I didn't get that far) then bring them into Canvas (my ST software of choice, only because I know it in and out) fix the palletes, and then maybe reduce the sprite size to fit in the original sprite sizes on the ST.
Edit: if that was your plan too, I don't want to step on your toes, but I would like to try myself regardless, as this is without doubt my favorite arcade game of all time.