J. Schlotman
Analyst · Guggenheim Securities
Thanks, Rodney, and good morning, everyone. As Rodney said, we've been through periods like this before, and we have the leaders and the strategy to continue delivering value to our customers, associates and shareholders. While the quarter and the year aren't shaping up the way we expected, we continue to be well positioned for the long term.
We continue to see a strong flow of capital projects. We've tried to be very clear about our deliberate ramp-up of capital spending since 2012. As the management team, we recognize the environment and believe it is prudent to reduce capital investments, excluding mergers, acquisitions and purchases of leased facilities, to $3.6 billion to $3.9 billion for 2016 and 2017. This is still a substantial investment in the business.
Consistent with our long-term financial strategy, we're maintaining flexibility with our cash flow to invest in the business, repurchase shares and maintain a growing dividend. Our philosophy is to always create value for shareholders. And while our Customer 1st approach remains our distinctive business strategy, we implement multiple approaches to deliver shareholder value.
There are many gives and takes in any quarter and year, and we view our ability to adjust to return value to shareholders as the core strength of our financial strategy.
Identical supermarket sales without fuel came in at 1.7%, impacted by deflation across most departments, with the exception of produce and pharmacy. We are seeing significant deflation in milk, eggs and cheese. We will continue to focus on growing households, growing units and making sure we are delivering the right value proposition for our customers.
As Rodney pointed out, we continue to do all 3 of these things during the second quarter. That our team accomplished this in such a deflationary environment is no small feat and demonstrates that our associates continue to connect with customers in a personal and meaningful way.
As you know, a strength of our Customer 1st model is that we make regular investments in our people, products, shopping experience and price. As Rodney said, we added hours to keep up with unit growth, and we also continued our price investments as evidenced by our lower gross margin. We balance these investments based on the needs we see in the business to drive sustainable results over time.
Operating costs, excluding fuel, Roundy's and the pension agreements, were better by 6 basis points in the second quarter. A lower expected bonus is one driver of these results. We'll continue to focus on cost controls and use those savings to provide additional value to customers.
Now for an update on retail fuel. In the second quarter, the average retail price of a gallon of gas declined by $0.47 compared to last year. Our cents per gallon fuel margin was approximately $0.198 compared to $0.19 in the same quarter last year. On a rolling 4 quarters basis, we are at $0.184 this year compared to $0.186 last year. We expect this rolling 4-quarter comparison to further decline as we cycle some very strong margins for the rest of the year.
A variety of factors contributed to our net earnings per diluted share results in the second quarter. Deflation was clearly a headwind, and that was offset by a lower-than-expected affected income tax rate due to the adoption of a new accounting standard.
Our second quarter net earnings per diluted share on a GAAP basis was $0.40 compared to $0.44 during the same period last year. Our net earnings per diluted share results included charges related to the restructuring of certain pension obligations to help stabilize associates' future benefits. Excluding the effects of these charges, Kroger's adjusted net earnings were $454 million or $0.47 per diluted share.
Our integration with Roundy's continues to be on plan. We have 2 dedicated management teams, one for Roundy's in Wisconsin and one for Mariano's in Illinois, to take into account the uniqueness of the formats in each location. These leadership teams have a mix of Kroger and Roundy's experience. We are pleased with the early results of our Roundy's investments in Wisconsin, and we remain excited about this opportunity.
During the second quarter, corporate brands represented approximately 27% of total units sold and 26% of sales dollars, excluding fuel and pharmacy. Our corporate brands team continues to drive innovation in important categories.
Earlier this week, we launched a new, more affordable corporate brand line of cage-free eggs. As you may know that earlier this year, we committed to a 100% cage-free eggs supply chain by 2025. In order to reach that goal, we want to help customers shift from conventional eggs to the cage-free category. By offering a lower-price alternative to most other cage-free eggs on the market today, we believe our mainstream customers will begin to migrate to the cage-free category.
Our net total debt to adjusted EBITDA ratio increased to 2.11 compared to 2.02 during the second -- the same period last year. This result illustrates our commitment to use free cash flow to both grow our business and return cash to shareholders while maintaining an appropriate level of leverage for our credit rating. Over time, we would expect our net total debt to EBITDA ratio to grow if we continue to successfully negotiate restructuring of troubled multiemployer pension plan obligations to help stabilize associates' future benefits. We would not expect this increase to adversely affect our credit rating as the rating agencies already contemplate our multiemployer pension plan obligations, and the additional debt we would take on to fund these plans will be offset in a reduction of our off-balance sheet multiemployer pension plan obligations.
Over the last year, Kroger's used free cash flow to repurchase $1.1 billion of common shares, pay $406 million in dividends, invest $3.8 billion in capital and merge with Roundy's for $866 million. Return on invested capital for the second quarter was 13.95%, excluding Roundy's, compared to 14.24% for the second quarter of 2015. Our balance sheet is as strong as ever.
I will now provide a brief update on labor relations. We recently agreed to new contracts covering store associates in Little Rock, Nashville and Southern California. We are currently negotiating contracts with the UFCW for Fry's associates in Arizona and store associates in Michigan and Atlanta. We also negotiated a new contract with the Teamsters for our Roundy's distribution center.
Our objective in every negotiation is to find a fair and reasonable balance between competitive costs and compensation packages that provide solid wages, good quality, affordable health care and retirement benefits for our associates. Kroger's financial results continue to be pressured by rising health care and pension costs, which some of our competitors do not face. Kroger and the local unions, which represent many of our associates, have a shared objective, growing Kroger's business and profitably, which will help us create more jobs and career opportunities and enhance job security for our associates.
I'd like to take a moment to highlight our $111 million commitment to the UFCW consolidated pension plan. This is part of an agreement to transfer the liabilities of 2 troubled multiemployer pension plans, which protects pensions already earned and will provide greater stability for future benefits of more than 6,500 Kroger associates and retirees. This is the latest in a series of steps we've taken during the last 4 years to provide greater stability of current and future benefits for Kroger associates and enhance the prospects for future returns while continuing to deliver strong shareholder value.
In 2012, we agreed to establish the UFCW consolidated pension plan by working with the unions to consolidate 4 multiemployer pension funds into one. That agreement protected benefits -- that agreement protected earned benefits and provide a greater stability of the future benefits of more than 65,000 Kroger associates.
In 2014, we announced similar agreements with 2 additional multiemployer pension funds. And in 2015, we accelerated contributions to the consolidated plan. We are proud of our ability to do this even in a tough operating environment. We intend to continue looking for opportunities to leverage our strong financial flexibility to safeguard associates' benefits, increase certainty and control over future benefit obligations and continuing to deliver strong shareholder value.
Turning now to our 2016 guidance. As a result of continued deflation, we lowered our net earnings guidance to a range of $2.03 to $2.13 per diluted share for 2016. Kroger's adjusted net earnings guidance range per share -- per diluted share for 2016 is $2.10 to $2.20, which excludes the $0.07 charge from the company's commitment to restructure certain pension obligations. The previous guidance range was $2.19 to $2.28, which did not anticipate the $0.07 charge from the company's commitment to restructure the pension obligations.
Shareholder return will be enhanced by a dividend that is expected to increase over time. For identical supermarket sales growth, excluding fuel, we expect the remainder of 2016 to be in the 50 basis point to 1.5% range, which is 1.4% to 1.8% for the full year. Finally, we now expect Kroger's full year FIFO operating margin in 2016, excluding fuel, to decline slightly compared to 2015 results.
Now I will turn it back to Rodney.