Detroit Free Press Marathon Fueling Plan & Pace Chart

Detroit Fueling Strategy

Detroit has a stranger shape than its 388 feet of elevation gain suggests. All of the climbing that matters happens twice, both times before mile 8, once up and over the Ambassador Bridge and once down and back out of the Detroit-Windsor Tunnel. After that you get eighteen of the flattest miles in American marathoning, with about 35 feet of total variation between mile 8 and the finish. The course does not test your legs. It tests whether you handled two disruptions early and then kept eating through a very long quiet stretch where nothing forces you to think about it.

Start with what is actually on the course, because Detroit's setup is unusually lopsided. Absopure water and Gatorade Endurance Lemon Lime are at all eighteen fluid stations, and the Endurance formula is worth counting: 22 grams of carbohydrate and 310 milligrams of sodium per 12 ounces, which at a normal four or five ounce race pour is 8 to 10 grams of carbohydrate and 105 to 130 milligrams of sodium per cup. That is real fuel and genuinely good sodium, better than most races hand you. The gels are a different story. There are exactly two GU stations, at mile 10.1 on 2nd Avenue and at mile 16.2 on Wilkins Street. After mile 16.2 there is no carbohydrate on this course except what is in a paper cup. If your plan assumes you can top up at mile 22, you do not have a plan. Carry everything you intend to eat from mile 16 onward.

The first two miles are flat and straight west on Fort Street, and there is only one fluid station in them, at mile 1.55 at 24th Street. Take your first gel there or just before it, around 12 to 15 minutes in. It will feel early. The reason is the gap that follows: the next fluid is at mile 4.00 on Huron Church Road in Windsor, which means 2.45 miles with nothing to drink, covering the biggest climb and the biggest descent on the course. A gel taken at mile 3 on the bridge deck with no water to move it is a bad trade.

The bridge climb starts around mile 2 and tops out just past mile 3 at roughly 740 feet, about 145 feet above the start, averaging a little over 2 percent. Run it by effort and let the pace go. The more expensive half is the other side. From the high point to mile 3.8 the road drops about 134 feet over eight tenths of a mile, better than 3 percent, and it arrives at exactly the moment you feel good and the view is spectacular. Runners give back four minutes at mile 22 for the ninety seconds they steal here. Also note that the race asks you not to stop for photos on the bridge, so plan to look and keep moving.

Windsor is your first real fueling window. Miles 4 through 6.3 run flat along Riverside Drive West with the river on your left, and the wind is either helping or hurting the whole way with nothing to block it. Stations sit at 4.00 and 5.38. Take a gel at the Riverside station at 5.4 and drink properly at University and Goyeau at 6.6, because that is the last aid before the tunnel and the next one is at mile 8.46.

The tunnel runs from about mile 7.15 to mile 8.05, just under a mile, with the roadway 75 feet below the river at its lowest point. The profile drops about 70 feet on the way in and climbs it back on the way out. It is warmer and stuffier than the air outside, your GPS will drop and then resume on the Detroit side, and there is no aid station inside. Treat it as a 6 to 8 minute heat exposure in the middle of an otherwise cool race. Do not eat in there. Run it by breathing rather than by pace, expect the climb out to feel harder than the numbers say, and drink at the Joe Louis Fist station at 8.46 as soon as you are back on Jefferson.

Miles 8 through 13 are where the race quietly becomes a normal marathon. The course rises about 25 feet from the tunnel exit through downtown, Grand Circus Park and Midtown, which you will not feel. Stations at 8.46, 9.42 and 10.19, plus the first GU at 10.12. Two things happen here. The International Half splits off the course at about mile 10.85, so the field around you thins sharply and stays thin. And halfway falls at 13.11 on the high ground of Woodbridge, which is your audit point: at 75 to 90 grams an hour you should have four or five gels down by then. If you are behind, miles 13 to 18 through Cass Avenue, the District and Eastern Market are your last easy place to catch up.

Take the second GU at mile 16.15, or your own gel there, and take another around 18 to 19. Mile 18 drops you about 28 feet into the Dequindre Cut, the below-grade rail greenway, and spits you out onto E. Lafayette at 18.6 for the flattest eight miles you will run all year. Miles 18.6 to 20.4 out, Indian Village and West Village from 20.5 to 23, then back down E. Lafayette from 23 to 25.3 before Larned and the Woodward finish at Campus Martius. There is no finishing climb and there are no crowds worth speaking of on the Lafayette return. Flat, straight, wind-exposed and quiet is the single most reliable way to under-fuel by accident. Set an alarm rather than trusting feel, and get your last carbohydrate in by mile 22 or 23 at the latest, using the 22.96 station to wash it down.

Weather usually helps. Historical race-day averages are a mean of 51 degrees with a 44 to 58 range and 79 percent humidity, and a 7 a.m. start puts the first hour in the mid-40s. That is close to ideal for gut absorption and an argument for running at the top of the 75 to 90 gram range rather than the bottom. It also means cold hands for the first hour, so pre-tear your gel tabs before the gun and carry gels under a layer. Two contingencies are worth planning. A warm year turns the tunnel into a genuinely unpleasant few minutes and you should back off there rather than defend pace. A wet, windy year, which is what 2025 delivered, makes the Windsor riverfront and the E. Lafayette return the two places the day gets decided, and both are stretches where the only thing you control is whether you kept eating.