your mileage may vary
It may work differently in your situation, or be different in your experience.
The battery lasts a day in my phone, but your mileage may vary.
ADJ
annual, weekly
high, low
The used truck had high mileage, but the engine still ran perfectly.
unlimited
The rental company offered unlimited mileage, so we drove across the entire country without extra charges.
VERB + MILEAGE
cover, do
My old truck has covered over 200,000 miles since I bought it ten years ago.
MILEAGE + NOUN
allowance
My employer increased the mileage allowance last month because of rising fuel prices.