the fuel presure effect is only bad in batch mode if u dont have a fuel pump capable of supplying enough volume. for most ppl who build stuff this isnt an issue.
sequential will slightly extend how much hp a pump is good for and i mean slightly.
batch or seqential if u see fp droping at injector opening u need a bigger pump
in case of milage it really dont make a difference it may lean a cyl ever so slightly, ewere talking about maybe a 2 psi drop on a poorly designed fuel system with batch fire. and fuel presure will recover normally before the next injector firing
if u had this issue with abatch fire system u could calculate how much less fuel is being injected during the presure drop in the rail but 2-3 psi isnt going to make that much of a difference
heres some big power cars running everything from ms1 to ms3
the ls1 silverado that makes
1000+ whp and 1050+wtq
is running ms1 with extra code
the hardware is more then capable of what any of us need.
unless ur some top tier racer who needs every last 1/4 hp u can get out of somethign megasquirt will work, and do a great job
i trust my ms1 on my camaro to 8500 rpms controlling fuel ignition and 2 stages of nitrous, along with an antilag system and a traction control system it has never missed a beat. thats a whole lot of calculations it needs to do before every injection and spark event more so then an engine with just seqential injection and ignition