43 MPG Honda Si (10th gen)

[jeff.decker]

Just turned 10,000 miles in my 2018 Honda Civic Si
(1.5 liter 4 cyl turbo)
Averaging 43 MPG over that whole 10,000 stretch
driving like a granny, premium gas, mainly fwy commute
but includes about 2000 city street miles and a few canyon runs

Drove a 2009 Honda Si for 250,000 miles before this
and never got better than 38 MPG over a 10K stretch

[Ecky]

Nice economy in a car that will hit 60 in less than 7 seconds, and has no electrical propulsion. Any mods?

[CVTCivic]

Are you driving the CVT or manual transmission?

@herektir
Is also driving a 10th gen Civic, are you still owning the car?

[herektir]

Yes winter brought 90 day avg down but since ownership 15or 16k miles is about 50 mpg with manual transmission 2.0l engine, no mods.

[CVTCivic]

50 mpg is amazing, I'm currently at 37 mpg with the 1.5 and the automatic transmission obviously. To get over 50 mpg I have to drive very slow, speeds below 50 mph are not very save on the Autobahn.

Here are some impressive hypermiling posts from a Civic forum:

My best is 64 across 37 miles, and Wayne Gerdes got 72.6 over 95 miles in an EX-T coupe (calibrated). Odometer showed 72 mpg across 93.7 miles, so not too far off.

Just finished my 2nd 600 plus tank in a row. This one was 634 and I filled up with 11.964 gallons. My Odometer reads about 3% low due to me using 50psi in the tires...

[GJKH]

Originally Posted by jeff.decker

Just turned 10,000 miles in my 2018 Honda Civic Si
(1.5 liter 4 cyl turbo)
Averaging 43 MPG over that whole 10,000 stretch
driving like a granny, premium gas, mainly fwy commute
but includes about 2000 city street miles and a few canyon runs

Drove a 2009 Honda Si for 250,000 miles before this
and never got better than 38 MPG over a 10K stretch

excellent

[M_a_t_t]

In case you hadn't seen it, honda issued a warranty on your engine for loss of power/oil dilution.

https://www.consumerreports.org/car-...turbo-engines/

[CVTCivic]

I drive the same car and I'm only getting an overall fuel consumption of 38 MPG (6.1 l/100km). Although on the last few fuel tanks I got 43.5 MPG (5.4 l/100km).

Found that picture on the Civic forums, someone took the hypermiling with this car to a new level:

[CVTCivic]

Although OP is gone for a long time now. It fits this thread:

this one Hypermiler on the CivicX forum did 700 miles with one single fuel tank. He was averaging 60 MPG without any ecomodding.