2018 s550 gt manual mpg on track?

[Anviltester]

Trying to get an idea of real world mpg for a full road race s550 (2018) w/ manual transmission and the 373 gear. Ditching the saddle tank for a fuel cell and trying to determine what size I will need to finish the sprint races we do. I have been told around 4 mpg but don't know if that's low or accurate. Motor is all stock for the class - even will run a restrictor in one of the 2 classes it will run in. Please only real world answers - I can guess all day but trying to solve this before it goes testing and realize the cell is too small lol. Thanks!

 

[MrBD1348]

My 2022 manual w/3.55 gears gets around 3 mpg on e85. I was burning around a half a tank of e85 in a 20 minute session at Road America.

5-6 laps + Out Lap on a 4mile track and was adding almost a full VP jug (6 gallons) after each session.

 

[Anviltester]

how much more burn is there with e85 over like 98 oct gasoline?

 

[Mad Hatter]

Its about 30% more.

 

[flyhalf]

3-5 mpg
3 with e85
4 with gas
5 if.....slow(jk)

 

[Anviltester]

so now I need to find a 20-24 gal cell that mounts in the spare tire well. got some measuring to do. Thanks all

 

[flyhalf]

so now I need to find a 20-24 gal cell that mounts in the spare tire well. got some measuring to do. Thanks all

Please share if you find it.

 

[JP X]

3-5 mpg
3 with e85
4 with gas
5 if.....slow(jk)

Flyhalf killing me...I get 5.9mpg on track.

 

[flyhalf]

Flyhalf killing me...I get 5.9mpg on track.

5.9 i would Balling

 

[Mad Hatter]

5.9mpg!! holy Sheet! I am happy with 3.5mpg with 98. Do you stay below 7000 rpm?

 

[JP X]

5.9mpg!! holy Sheet! I am happy with 3.5mpg with 98. Do you stay below 7000 rpm?

There's a few things:
1: that was with the Ford Power Pack 2 tune w/93. Not one of the fancy-dancy high performance tunes. We'll see this weekend what I get with the new motor and HP tune.
2: yes, stay below 6,750
3: I am slow.

 

[Mad Hatter]

Hey! if your having fun and getting 5.9mpg while your engine loves you, what can be bad about that? I saw on your build thread that you had an engine fail on you before, that always leaves a scar.

 

[txgt]

Flyhalf killing me...I get 5.9mpg on track.

Right! I was happy when I got 6.0 MPG at Eagles Canyon Raceway!

 

[TMSBOSS]

Usually in the 5’s. Except at Road America where brakes and fuel just seem to disappear.

 

[navseng]

so now I need to find a 20-24 gal cell that mounts in the spare tire well. got some measuring to do. Thanks all

atl makes a 16 gal

 

[flyhalf]

atl makes a 16 gal

View attachment 91241

Interesting. Not sure 16 is enough for 40mins tho

 

[navseng]

Interesting. Not sure 16 is enough for 40mins tho

Where are you running 40 min?

 

[flyhalf]

Where are you running 40 min?

Well my dream is still ST national lol. I mena is almost impossible but who know lol
Otherwise a fuel surge tank is a better option IMO. Cause you have 16gal oem tank plus 1gal surge tank.

 

[navseng]

Well my dream is still ST national lol. I mena is almost impossible but who know lol
Otherwise a fuel surge tank is a better option IMO. Cause you have 16gal oem tank plus 1gal surge tank.

Oh well that could happen. Good thing about that is with all the yellow flags you won't need to worry about fuel for a full 40 min lol.

I would still do a surge tank probably especially since you have one. I did with mine

 

[PatrickStapler]

I always thought of it as SPG...on the track...SMILES/GAL!!!