WASHINGTON (AP) — A key measure of inflation stayed high in February, before the war in Iran spiked gas prices, a sign that everyday costs were elevated even before the conflict began. Thursday’s report is largely a warm-up for the more important inflation data to be released Friday, when the government will publish the higher-profile consumer price index for March. The Friday report will be the first to reflect the impact of the gas price spike from the Iran war. Economists forecast it will show a big increase of 0.9% just in March from February, and a 3.4% gain from a year earlier.