Ive been doing alittle research on the Toyota maintenance manuals for a 2007. The total for all manuals is $462.46 If anyone has experience with these, which one(s) would a person choose that just wants to maintain their vehicle ? Vol #-1 Service/Maintenance/Engine Vol #-2 Suspension/ Drive/Axle Vol #-3 Navigation/Interior/Exterior Electrical Wiring It looks like #1 would cover all that is necessary plus maybe the Electrical. Thanks !!!