gallon - litre, yard - ?

METRE
List of words for the clue gallon - litre, yard - ? from the crossword:
UNIT PETROL ACRE POUND MILE LITER KILOMETRE KILOGRAM INCH RETAIL MAGNUM L CENTEMETRE PINTS PINT ALE QUART ASIS FEET
WordClue
ACRElitre - gallon, hectare - ?
INCHlitre - gallon, centemetre - ?
MILElitre - gallon, kilometre - ?
PUMPof petrol or heat
UNITcarat or gallon
YARDlitre - gallon, metre - ?
HERTZSI unit for frequency
LITREyard - metre, gallon - ?
MONTHunit of time dividing the year
OUNCEunit of mass
PENNYunit of currency in various countries
POUNDlitre - gallon, kilogram - ?
QUARTunit of volume
ENGINEturbojet or petrol
GALLONmetre - yard, litre - ?
HECTAREyard - metre, acre - ?
HUNDREDFranklin, yard
KILOGRAMgallon - litre, pound - ?
KILOMETREgallon - litre, mile - ?
CENTEMETREgallon - litre, inch - ?
KILOGRAMgallon - litre, pound - ?
BATTERYgalvanic or lead-acid