2018 Mustang GT: 12000 mi Update

The odometer on my 2018 Mustang GT now reads just over 12000 miles. Here are some details since the last update which was at 7000 miles.

Mileage: 12040 miles

Average MPG: 14.6 mpg on 93 octane fuel

Services and Modifications:

  • 1 Oil change – 10 quarts of Motorcraft Full Synthetic 5W-50
  • Driver’s side catalytic converter replaced at ~8300 miles (replaced under warranty)

Total maintenance costs: $159 (oil change)


2018 Mustang GT Update: Catalytic converter replaced at 8300 mi

Got a CEL at ~8300 miles on the car. Pulled code P0430 catalytic converter efficiency on cylinder bank 2. Took it into a Ford dealer, waiting to hear back tomorrow. Guy at AutoZone said it’s probably spark plugs (which were replaced when I got the Roush SC installed) but I think it’s the O2 sensor. We shall see hopefully tomorrow morning.

UPDATE: Got a call back from the dealer, it seems the cat has actually failed. Shocking for a car with just around 8300 miles.

2018 Mustang GT 1st Year Ownership Report

Haven’t posted in a while but I figured I should share this first milestone of ownership. I am thinking about doing a Car & Driver style guide of recording events in my car’s history here. Here is a breakdown of what has happened so far in one year of owning this car:

Mileage: 7015 mi

Average MPG: 14.1 mpg on 93 octane fuel (mainly city driving)

Services and Modifications

  • 1 Full Synthetic oil change
  • ROUSH Phase 1 Supercharger installed
  • ROUSH Cat-back exhaust installed

Major issues: None

Minor issues: Typical Mustang interior rattles and absolutely awful P Zero Nero A/S tires

Total maintenance costs: $120 (oil change)



The 2020 Mustang Shelby GT500 finally unveiled + I got a new exhaust!

Sorry for the radio silence as of lately, I have been quite busy with college and work. I am very late to the GT500 news round but here it is, the mighty GT 500!


The full press kit is available here: https://www.mustang6g.com/forums/threads/official-2020-shelby-gt500-mustang-press-release-specifications-photos-videos.115819/ but here is a quick run down:

  • Supercharged, cross-plane crank 5.2L V8, output of 700+ HP projected (numbers not finalized). Utilizes a 2.65L TVS roots-type supercharger by Eaton (same rotating assembly used by the 2018-2019 ROUSH Phase 1 SC Kit and the Corvette ZR-1!)
  • 7-speed Dual Clutch Transmission sourced from Tremec (same guys who build the GT 350’s 6 speed manual), with shift times of under 100ms
  • Available Carbon Track Pack with 20″ carbon fiber wheels and GT4 class carbon fiber spoiler
  • Massive 16.5″ two piece steel brake rotors matched with 6 piston Brembo calipers
  • Michelin Pilot Sport 4S or Cup 2 rubber
  • All new hood vents and cooling system up front
  • Interior upgrades with new materials and finishes

Looks like an absolute monster to me, can’t wait to see more info and what they look like in person. The DCT is what should give it a real edge over the ZL1 and the Hellcat, but we just have to wait and see.

I also got a ROUSH Cat-back installed on my 2018 GT and what a difference it makes! The sound is raspy, aggressive, and just plain loud. Really makes a huge difference in the driving experience and adds even more fun to an already fun daily driver. I will be posting a sound clip soon.

I will also try to start posting more often here and on The Stack Underflow Blog. Till next time.