My first car was a second hand A30 bought for £25, new tyres cost me more than the car. I had took the sump and head off removed the pistons then towed the car to a workshop where the the cylinder block was rebored, then I put it all back together. I had to run the engine. I didn't check the mpg but the specification states the same value as the A35.
The A30 only had an 803cc 29bhp engine but the A35 had a 948cc 35 bhp engine.