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How long is the run to the garage? Is there a regulator in front or in the basement (I do not know too much about plumbing in the colder climates)? The longer the run, the more pressure drop. We sometimes run a 1" pipe under the house but it bypass the regulator to get full pressure / volume to the back yard for washing purposes. You might want to check the pressure at the exterior faucet. it should read 60-65lbs. Then check the garage and see if there's any drop in pressure. If the pressure coming in is good, how about installing an additional line to the back of the house so you can wash the cars and make sure you bypass the regulator that feeds the house.
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