What you meant to say was, "Which Saturn S Series for best MPG's" because the SL is actually one of the models.
It goes like this for the sedans:
SL - SOHC engine, entry level, no options (will have crank windows, no A/C, etc.)
SL1 - SOHC engine, most all options available
SL2 - DOHC engine, all options available
With babies involved, I'd look for an SL1 with A/C.
The SOHC engine when paired with a 5sp is capable of great MPG. Heck, the SOHC with an auto is capable of a lot more than the EPA rates it at.
If your wife can't drive stick, I wouldn't have any regrets getting an SL1 auto, it'll still get 35+ mixed and probably 40mpg highway. This is of course, if you drive it like it was intended to be driven... slow and steady.
I own both a DOHC and a SOHC S-series and honestly the SOHC is rated at 24 hp less (yes, that means 100hp total) but they both perform about the same... slow and gutless. Only difference you'll notice between the DOHC and SOHC is when pushing the engines above 4,500 rpm, if you're saving gas that should never happen anyway, so a SOHC will be fine.
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John
'09 Saturn Aura 2.4L
'94 Chevy Camaro Z28 (5.7L 6sp)
'96 Chevy C1500 (5.0L 5sp)
'08 Kawasaki Vulcan 900 Custom
'01 KTM Duke 2
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