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The 1,900 pound weight of a VW beetle is much lighter then your current car, so just like how I'm to heavy for 10 speed bike tires to work well you might find that 125mm wide tires are to narrow for the weight of your car.
You don't say what kind of car you have or even your full tire size so it's hard to say if there is a better match, you should be able to go narrower and not see a drop in mileage but 70mm narrower seems a bit harsh, your best bet would be finding a low rolling resistance (LRR) tire and lighter wheels that have a smooth face, something like Saturn SL1 alloy wheels.
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