U.S. workers are on track to replace 57% of their current income in retirement, up from 56% 6 months ago.

Researchers at Fidelity Investments, Boston, have published those figures in a summary of results of a recent survey of 2,000 working adults ages 25 and over with annual household incomes over $20,000.

About 52% of survey participants said they have taken some action, such as increasing retirement account contributions or reallocating portfolios, in the past 6 months, researchers say.

But the researchers note that 76% of participants say rising fuel prices have reduced their ability to save for retirement.