Thank you, and good morning, everyone. On the call with me this morning are Joe Kim, Sunoco LP's President and Chief Executive Officer; Karl Fails, Chief Operations Officer; Dylan Bramhall, Chief Financial Officer; Austin Harkness, Chief Commercial Officer; and other members of the management team.
Today's call will contain forward-looking statements that include expectations and assumptions regarding the partnership's future operations and financial performance. Actual results could differ materially, and the partnership undertakes no obligation to update these statements based on subsequent events. Please refer to our earnings release as well as our filings with the SEC for a list of these factors.
During today's call, we will also discuss certain non-GAAP financial measures including adjusted EBITDA and distributable cash flow as adjusted. Please refer to the Sunoco LP website for a reconciliation of each financial measure.
It has been a busy and exciting start to 2024 for the Sunoco team, and I'd like to begin my comments by reviewing some of that activity. First, on March 13, we completed the acquisition of 2 liquid fuels terminals located in Amsterdam, Netherlands and Bantry Bay, Ireland from Zenith Energy for EUR 170 million. Then on April 16, we completed the divestiture of 204 convenience stores across West Texas, New Mexico and Oklahoma to 7-Eleven for approximately $1 billion. And just last week, we closed on the acquisition of NuStar Energy in a transaction valued at approximately $7.2 billion. The completion of these strategic transactions will not only increase the partnership's stability but will also strengthen our financial foundation and position us for future growth.
Now turning to our first quarter results for 2024. Sunoco delivered a record first quarter with adjusted EBITDA of $242 million compared to $221 million a year ago, an increase of 9%. As Karl will discuss later, this quarter's results demonstrate that our continued focus on gross profit optimization in our fuel distribution business has helped grow our fuel gross profit dollars over time. In the first quarter, the partnership sold over 2.1 billion gallons, a record volume for the first quarter and a 9% increase from last year. Fuel margin for all gallons sold was $0.117 per gallon, compared to $0.129 per gallon a year ago. Fuel margin results include the benefit of a $25 million 7-Eleven makeup payment.
Total first quarter operating expenses were $142 million, an increase of $15 million from the first quarter of last year. The vast majority of this year-over-year increase can be attributed to additional operating expenses from growth including the Zenith North America terminal acquisition and transaction costs related to acquisition and divestiture activity in the first quarter of this year. In the first quarter, we spent $27 million on growth capital and $14 million on maintenance capital. First quarter distributable cash flow as adjusted was $176 million, compared to $160 million in the first quarter of 2023. On May 3, we declared an $0.8756 per unit distribution, a 4% increase over last quarter. This increase demonstrates continued confidence in our business and our ability to deliver value to our unitholders through distribution increases.
Turning to the balance sheet. At the end of the first quarter, we had approximately $870 million of liquidity remaining on our revolving credit facility. Leverage at the end of the quarter was 3.7x, unchanged from last quarter, and below our long-term target of 4x. In anticipation of and in conjunction with the closing of the NuStar acquisition, the partnership recently completed several financing transactions. First, on April 30, we issued $1.5 billion in senior notes in a private offering. The proceeds from this offering will be used to fund the repayment of NuStar's credit and receivables facilities and redeem NuStar's preferred equity and subordinated notes. The reduction in interest expense from this refinancing activity will generate at least $50 million in additional cash flow annually.
Second, on May 3, we entered into a new $1.5 billion revolving credit facility, which matures in 2029. This new credit facility is fully unsecured and will simplify Sunoco's capital structure, and enhance our credit profile moving forward. To that end, both Moody's and S&P upgraded Sunoco's long-term credit ratings over the past week, further demonstrating Sunoco's enhanced scale and stability and improved financial profile. Now that we have closed the NuStar acquisition, I want to share an update on our 2024 guidance. We plan to issue more detailed outlook on or before our second quarter earnings call. But as a starting point, we wanted to provide the following perspective on consolidated 2024 guidance.
We now expect 2024 adjusted EBITDA to be in the range of $1.46 billion to $1.52 billion. This increase reflects the combination of our reaffirmed adjusted EBITDA guidance of $975 million to $1 billion for the legacy Sunoco business. Additionally, the increase includes the contribution of approximately $480 million to $520 million of adjusted EBITDA from the NuStar acquisition. The expected contribution from NuStar reflects a prorated portion of the 2024 adjusted EBITDA guidance the NuStar management team provided in February. This revised 2024 adjusted EBITDA guidance excludes both transaction costs and synergies, which we will also provide more detail on, on or before our second quarter earnings call.
With that, I will now turn the call over to Karl to walk through some additional thoughts on our first quarter performance and recent transaction activity.