Low MPG after rebuild

[Danielban92]

Hi,

just received my car back from a full engine rebuild. Not very clued up on engines so may seem like a silly question.

car hasn’t had any big runs and only done about 50 miles so far. My mpg is showing at 9.7mpg.

is this normal after a rebuild? Bearing in mind I do have upgraded parts such as Mahle forged pistons and ZRP conrods. King racing bearings. Airtec Stage 3 induction kit. Rsport pro400 intercooler and 3 inch downpipe. Planning on getting it stage 3 remapped after the break in period.

I know that fuel consumption will increase as the ECU and parts break in properly but surely 9.7mpg is extremely low?

any input would be very helpful.

thank you

 

[SteveS]

Considering that the early miles on a new engine should consist of no steady running and repeated gentle acceleration, I don't think mpg over the first 50 miles should be of concern.