Ours is a 2010 Corolla 1.8 L 4 Cyl automatic transaxle
The advertised mileage 7.8 / 5.7 liters per 100 kms and 6.6 average
Now the real mileage is 8.1 / 6 liters per 100 kms not towing.
7 average on trips when we visit. Long trips will have more hiway
100 kms = approx 60 mph and 4 Liters = approximately 1 US gallon
7 L per 100 for US ( 7 / 4 = 1.75 US gal ) per 60 miles or 34 mpg average around the Sound not towing.
So far seems to be about 20% drop in mileage towing or about 27 mpg; will have to update later with accurate info after we make a long trip.
My wife drives from location to location for here job and mileage includes warm ups at winter temperatures. Yesterday was -24 c to day is nice though only -6 c ( -11 f to 21 f )
Our city is in a valley so lots of steep hill climbing.
We have a customized car from dealer with full tow package ordered at time of purchase.
-progressive transaxle cooler
-Proportional braking system and 7 pin wiring harness from dealer
Now for car upgrades:
-B&M 10226 Stage 1 RV heavy duty Shift improver Kit
-Custom made Class III receiver with equalizer weight
So far pulls great as the trailer is so light
just do not have the mileage on a long tip to give the towing mileage. Hyway pull at 80 kms hr about 50 mph in town 50 kms or 30 mph.
Trailer tracks well but we will be adding:
-Shocks for northern parks as feel it is a good idea; have kit.
-st205r14 c rated tires
to to raise max load to over 3500 lb limit of axle
as the car tires
same size maxed out at 3040 lbs and trailer c rated 6 ply trailer tires
equal 3750 lbs total. (Original factory tires were b rated bias 4 ply tires at about 3100 lbs )
-breakaway switch as mto says we need it to be legal before our next trip was only $17